pillow

Abstract

A pillow 1 with elastic resilience according to the present invention is characterized by being provided with: a low section 8, which is located in the area opposite a neck NC of a supine person and is recessed so that the elastic resilience of the pillow 1 does not compress the cervical vertebrae C1 to C4 of the supine person; middle sections 10, which are higher than the low section 8, are located on the left and right sides of the low section 8, and support the left and right sides of the cervical vertebrae C1 to C4 of the supine person by means of the elastic resilience of the pillow 1; and high sections 9, which are higher than the middle sections 10, are located on the left and right sides of the middle sections 10, and press the posterior belly of the digastric muscle (PDM) of the supine person by means of the elastic resilience of the pillow 1.

Description

pillow

[0001] The present invention relates to pillows, and more particularly to the ability of pillows to facilitate breathing for the user.

[0002] Being able to breathe easily even in a sleeping position is essential for sleep quality. Therefore, pillows are required to have the function of making breathing easier for the user. To make breathing easier, especially when lying on one's back, it is necessary to maintain an appropriate head angle. If the head is tilted too far forward (i.e., if the chin is lowered too much), the airway is compressed, which can make breathing difficult. Conversely, if the head is tilted too far back (i.e., if the chin is raised too much), the base of the tongue sinks into the throat, which can lead to apnea. Therefore, for example, Patent Document 1 discloses a pillow that supports the neck to the back of the head and reduces the support force at the back of the head to prevent the chin from dropping.

[0003] Japanese Patent Application Laid-Open No. 2020-81248

[0004] When a person lying on their back inhales, air flows through the trachea toward the lungs. The muscles at the base of the tongue (glossus fascia) tense, keeping the trachea open. The jaw muscles also work, lifting the lower jaw upward. This widens the trachea and facilitates smooth breathing. During exhalation, air leaves the lungs and is expelled through the trachea. The glossus fascia relaxes, but the trachea remains open without narrowing. The jaw muscles also relax, allowing the lower jaw to return to its natural position. Simply put, the jaw muscles of a person lying on their back contract and expand with breathing, helping to keep the trachea properly open. However, if the posterior belly of the digastric muscle (the jaw muscle) becomes too relaxed due to aging or other factors, the lower jaw of the person lying on their back drops. This causes the hyoid bone to drop, compressing the anterior trachea and narrowing it, resulting in shortness of breath. Therefore, the present invention aims to provide a pillow that alleviates the breathlessness and allows for comfortable sleep.

[0005] The pillow of the present invention is a pillow with elastic resilience, characterized by having a low portion that is recessed in a position facing the neck of a person lying on their back so that the elastic resilience of the pillow does not compress the cervical vertebrae of the person lying on their back, a middle portion that is higher than the low portion and supports the left and right sides of the cervical vertebrae of the person lying on their back with the elastic resilience of the pillow on both sides of the low portion, and high portions that are higher than the middle portion and press the posterior belly of the digastric muscle of the person lying on their back with the elastic resilience of the pillow on both sides of the middle portion.In the present invention, "pressing the posterior belly of the digastric muscle" does not only mean directly pressing the posterior belly of the digastric muscle with the high portion, but also includes indirect pressing via a muscle located on the higher side (front) of the posterior belly of the digastric muscle. For example, on the higher side (nearer) of the posterior belly of the digastric muscle is the sternocleidomastoid muscle, which attaches to the mastoid process of the temporal bone. By pressing the sternocleidomastoid muscle on the side that attaches to the mastoid process of the temporal bone at a higher point, the posterior belly of the digastric muscle can also be pressed.

[0006] The pillow of the present invention has a high section that presses the posterior belly of the digastric muscle of a person lying on their back with the pillow's elastic resilience, preventing excessive relaxation of the posterior belly of the digastric muscle, thereby preventing the lower jaw and hyoid bone from dropping and narrowing the trachea. This keeps the trachea open, thereby alleviating breathlessness. It also has the advantage of preventing the mouth from opening, further preventing snoring and apnea. Furthermore, by providing a recessed low section that does not compress the cervical vertebrae of a person lying on their back, the risk of cervical hernia and cervical spondylosis is reduced. Furthermore, by providing a middle section that supports both sides of the cervical vertebrae of a person lying on their back with the pillow's elastic resilience, the risk of neck stiffness is avoided. In other words, if the area around the cervical vertebrae is not supported at all, neck stiffness occurs, which leads to fatigue and shallow breathing, causing breathlessness. The provision of the middle section prevents this. In this way, the pillow of the present invention can improve breathlessness, relieve neck stiffness, and reduce the risk of developing cervical hernia or cervical spondylosis, allowing for comfortable sleep.

[0007] Fig. 3 is a perspective view of a human skull; Fig. 4 is a diagram of the back of a human head; Fig. 5 is a perspective view of a pillow according to an embodiment of the present invention; Fig. 6 is a rear view showing the correspondence between a pillow according to an embodiment of the present invention and a human head and neck; Fig. 7 is a cross-sectional view taken along line A-A of Fig. 3; Fig. 8 is a perspective view of a pillow according to another embodiment of the present invention.

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1A is a perspective view of a human skull, and Fig. 1B is a perspective view of the occipital region of a human head. In Fig. 1A and Fig. 1B, HD denotes a human head, SA denotes the occipital bone, SA1 denotes the external occipital protuberance, SA2 denotes the region between the superior and inferior nuchal lines of the occipital bone, SA3 denotes the parietal region of the occipital bone, SA4 denotes the superior nuchal line, SA5 denotes the inferior nuchal line, SA6 denotes the inferior line of the occipital bone, SA7 denotes the region from the left end of the trapezius muscle attached to the occipital bone to the part of the left sternocleidomastoid muscle attached to the occipital bone (a left predetermined region), and SA8 denotes the region from the right end of the trapezius muscle attached to the occipital bone to the part of the left sternocleidomastoid muscle attached to the occipital bone. The area up to the part of the right sternocleidomastoid muscle that attaches to the bone (a specified area on the right), SB is the parietal bone, SB1 is the occipital area of ​​the parietal bone, SC is the temporal bone, SC1 is the mastoid process, MA is the temporalis muscle, MB is the sternocleidomastoid muscle, MB1 is the attachment of the sternocleidomastoid muscle, MBP are the left and right sternocleidomastoid muscles that attach to the occipital bone, TR is the trapezius muscle, TR1 is the left end of the trapezius muscle, TR2 is the right end of the trapezius muscle, NC is a human neck, and C1 to C7 are the first to seventh cervical vertebrae.

[0009] FIG. 2 is a perspective view of a pillow 1 according to an embodiment of the present invention, FIG. 3 is a rear view showing the correspondence between the pillow 1 according to an embodiment of the present invention and a person's head HD and neck NC, and FIG. 4 is a cross-sectional view taken along line AA in FIG.

[0010] The X-axis, Y-axis, and Z-axis shown in Figures 3 and 4 are perpendicular to one another. In this embodiment, the X-axis direction is the vertical direction of the pillow 1, which corresponds to the height direction of a person lying on their back, the X1 direction is the upward direction, and the X2 direction is the downward direction. The Y-axis direction is the horizontal direction of the pillow 1, the Y1 direction is the leftward direction, and the Y2 direction is the rightward direction. The Z-axis direction is the front-to-back thickness (height) direction of the pillow 1, the Z1 direction is the forward direction, and the Z2 direction is the backward direction.

[0011] In Figures 3 and 4, DM is the digastric muscle. The digastric muscle DM is divided into an anterior belly and a posterior belly, and the anterior belly of the digastric muscle ADM originates from the mandible LJB and is attached to the hyoid bone HB via the digastric muscle intermediate tendon. The posterior belly of the digastric muscle PDM originates from the mastoid process SC1 and is attached to the hyoid bone HB via the digastric muscle intermediate tendon. UJB is the maxilla.

[0012] First, we will explain the technical features of the pillow 1. As shown in Figures 2 to 4, the pillow 1 is provided with: (1A) a pillow 1 having an elastic resilience, (1B) a low portion 8 that is recessed in a portion facing the neck NC of a person lying on their back so that the elastic resilience of the pillow 1 does not compress the cervical vertebrae (the first cervical vertebra C1 to the fourth cervical vertebra C4 in this embodiment) of the person lying on their back, (1C) a middle portion 10 that is higher than the low portion 8 and on both sides of the low portion 8 supports the left and right sides of the cervical vertebrae C1 to C4 of the person lying on their back with the elastic resilience of the pillow 1, and (1D) a high portion 9 that is higher than the middle portion 10 and on both sides of the middle portion 10 presses the posterior belly of the digastric muscle PDM of the person lying on their back with the elastic resilience of the pillow 1.

[0013] 2 to 6, the pillow 1 comprises: (2A) a main support portion 11 made of elastic urethane foam on the upper side of the elevated portion 9 in the height direction (X1 direction in the drawings), the main support portion 11 applying pressure to and providing planar support to at least a region SA7 (hereinafter referred to as the "left specified region") from a left end TR1 of a portion where the trapezius muscle TR is attached to the occipital bone SA to a portion where the left sternocleidomastoid muscle MBP is attached to the occipital bone SA) and a region (hereinafter referred to as the "right specified region") SA7 (hereinafter referred to as the "right specified region") from a right end TR2 of a portion where the trapezius muscle TR is attached to the occipital bone SA to a portion where the right sternocleidomastoid muscle MBP is attached to the occipital bone SA), within the region SA2 between the upper nuchal line SA4 and the lower nuchal line SA5 of the occipital bone SA of a person lying on their back; (2B) On the upper side X1 in the height direction of the main support part 11, there is provided a secondary support part 12 made of elastic urethane foam, set to a support height lower than that of the main support part 11, and supporting the head by applying pressure to the head side of the person's upper nape SA4.

[0014] Next, the pillow 1 will be further explained using Figures 2 to 4. As shown in Figures 2 to 4, the pillow 1 is a rectangular plate, and is configured so that the head HD of a person lying on their back rests on the center of the front side of the pillow 1, and the neck NC of the person rests on the lower side of the center of the front side of the pillow 1 (direction X2 in the figures). In addition, the pillow 1 has a bilaterally symmetrical structure, as shown in Figure 3.

[0015] The pillow 1 is composed of a rear base 2, a front lower base 3, a front upper base 4, a pair of left and right high-place portion forming bodies 5, a pair of left and right side regulating portion forming bodies 6, and a main regulating portion forming body 7.

[0016] The rear base 2 is made of a rectangular plate of elastic urethane foam having the same outer shape as the outer shape of the pillow 1 when viewed from the front side.

[0017] The front lower base 3 is a rectangular plate-like piece that covers the lower front side of the rear base 2 (below the center of the front side), and is made of elastic urethane foam that is thicker (higher) than the rear base 2, and has a notch 31 for forming a low part, which will be described later. The front lower base 3 is glued and fixed in a state where it is superimposed on the lower front side of the rear base 2, and the left and right center part of the front lower base 3 is located below the center of the pillow 1, and the upper part of the left and right center part of the front side of the front lower base 3 is located in the area SA between the upper nuchal line SA4 and the lower nuchal line SA5 of the occipital bone SA of a person lying on their back. 2, and the lower part of the left-right central part on the front side of the front-lower base 3 faces the neck NC from the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back, and further, of the lower part of the left-right central part on the front side of the front-lower base 3, the left-right central part faces the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back, and the left and right side parts face the posterior belly of the digastric muscle PDM of a person lying on their back, and further, the parts between the left-right central part and the left and right side parts face the left and right side parts of the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back.

[0018] The front-lower base 3 has a notch 31 for forming a low portion cut out by cutting out a portion of the front-lower base 3 facing the first cervical vertebra C1 to the fourth cervical vertebra C4, i.e., the left-right central portion of the lower portion in the left-right central portion of the front side of the front-lower base 3, thereby providing a recessed low portion 8 in the portion facing the neck NC of a person lying on their back so as not to compress the cervical vertebrae C1 to C4 of the person lying on their back with the elastic repulsive force of the pillow 1. The front surface of the rear base 2 is exposed at this low portion 8.

[0019] The pair of left and right elevated portion forming bodies 5 are made of elastic urethane foam in the shape of rectangular plates that cover the left and right sides of the lower portion of the front side of the front lower base 3, i.e., the portion of the front lower base 3 that faces the posterior belly of the digastric muscle PDM of a person lying on their back, and are thinner (lower) than the front lower base 3.

[0020] The front-lower base 3 has a pair of left and right high-portion forming bodies 5 adhered and fixed in an overlapping state to the left and right sides of the lower portion of the front-lower base 3, in a region facing the posterior belly of the digastric muscle PDM of a person lying on their back, i.e., on both sides of the lower portion in the center of the left and right sides of the front side of the front-lower base 3. This provides high portions 9, which are higher than the middle portion 10 described below and press the posterior belly of the digastric muscle PDM of a person lying on their back with the elastic repulsive force of the pillow 1, in a region facing the neck NC of the person lying on their back. Here, it is preferable that the high portions 9 are provided so that the corner formed by the step between the high portion 9 and the middle portion 10 faces the posterior belly of the digastric muscle PDM of a person lying on their back. This allows the high portions 9 to effectively press the posterior belly of the digastric muscle PDM of a person lying on their back directly or indirectly through the corner formed by the step between the high portion 9 and the middle portion 10.

[0021] The front-lower base 3 is provided with a low-portion forming notch 31 and a pair of left and right high-portion forming bodies 5, so that a middle portion 10 is provided at a portion facing the neck NC of a person lying on their back, which is higher than the low portion 8 and supports the left and right sides of the cervical vertebrae C1 to C4 of a person lying on their back on both left and right sides of the low portion 8 with the elastic repulsive force of the pillow 1, at a portion facing the neck NC of a person lying on their back, in other words, a portion between the left and right central portion (low portion 8) and the left and right sides (high portion 9) of the lower side of the left and right central portion of the front side of the front-lower base 3.

[0022] The front-lower base 3 is provided with a main support portion 11 made of elastic urethane foam on the upper side of the elevated portion 9 in the height direction (direction X1 in the figure) at a portion of the front-lower base 3 facing the area SA2 between the upper nape SA4 and lower nape SA5 of the occipital bone SA of a person lying on their back, i.e., at the upper portion in the center of the left and right sides of the front side of the front-lower base 3. The main support portion 11 applies pressure to at least a left predetermined area SA7 and a right predetermined area SA7 of the area SA2 between the upper nape SA4 and lower nape SA5 of the occipital bone SA of a person lying on their back to provide planar support. A middle portion 10 is provided at the same height as the main support portion 11.

[0023] The pair of left and right lateral regulating portion forming bodies 6 are rectangular plates that cover the left and right sides of the front side of the front lower base 3 located on the left and right outer sides of the main support portion 11 and the high portion 9, and are made of elastic urethane foam that is thicker (higher) than the high portion forming bodies 5.

[0024] The front upper base 4 has a pair of left and right lateral restriction part forming bodies 6 glued and fixed in an overlapping state to the left and right sides of the front side of the front lower base 3, which is located on the left and right outer sides of the main support part 11 and the elevated part 9, so that the lateral restriction parts 13 protrude higher than the main support part 11 on the left and right outer sides of the mastoid process SC1 of the temporal bone SC of a person lying on their back, and restrict the head HD of a person lying on their back from turning over (rotating only the neck NC to the head HD in the left and right lateral directions).

[0025] The front upper base 4 is a rectangular plate that covers the upper front side of the rear base 2 that is not covered by the front lower base 3, and is made of elastic urethane foam of the same thickness (height) as the rear base 2, with a notch 41 for forming a secondary support portion, which will be described later.The front upper base 4 is glued and fixed in a state where it is superimposed on the upper front side of the rear base 2 that is not covered by the front lower base 3, and the lower part of the left and right central part of the front upper base 4 is positioned in the center of the pillow 1, and the lower part of the left and right central part of the front side of the front upper base 4 is configured to face the head closer to the top of the head than the upper nape SA4 of a person lying on their back.

[0026] The front upper base 4 has a notch 41 for forming a secondary support portion that is cut out in a portion of the front upper base 4 that faces the head of a person lying on their back on the side of the head that is closer to the top of the head than the upper nape line SA4, i.e., in the lower portion of the center of the front side of the left and right sides of the front of the front upper base 4.This allows the front upper base 4 to have a secondary support portion 12 on the upper side X1 in the height direction of the main support portion 11, made of elastic urethane foam, which is set to have a lower support height than the main support portion 11 and which applies pressure to support the head of the person lying on their back on the side of the head that is closer to the top of the head than the upper nape line SA4.

[0027] The main regulating part forming body 7 is a rectangular plate that covers the upper front side of the front upper base 4 and is made of elastic urethane foam of the same thickness (height) as the front upper base 4, with a main regulating part forming notch 71 (described later) provided in it.This main regulating part forming body 7 is glued and fixed in place on the upper front side of the front upper base 4, and the lower part in the center of the left and right sides of this main regulating part forming body 7 is configured to face the secondary support part forming notch 41, i.e., the secondary support part 12.

[0028] The front upper base 4 has the main regulating section forming body 7 glued and fixed in place on the upper front side of the front upper base 4, and a main regulating section forming notch 71 is provided by cutting out the portion of the main regulating section forming body 7 facing the auxiliary support section 12, i.e., the lower portion in the center of the left and right parts of the main regulating section forming body 7, thereby providing a main regulating section 14 that is located on the opposite side of the auxiliary support section 12 from the main support section 11 and protrudes higher than the auxiliary support section 12, and regulates the upward movement of the head in the height direction of a person lying on their back.

[0029] Next, the effects of the technical features of the pillow 1 will be described. [Regarding Technical Features (1A) to (1D)] The pillow 1 includes a high portion 9 that presses the posterior belly of the digastric muscle PDM of a person lying on their back with the elastic repulsive force of the pillow 1. This prevents the posterior belly of the digastric muscle PDM from becoming too loose, thereby preventing the lower jaw and hyoid bone HB from dropping and narrowing the trachea. This keeps the trachea open, thereby alleviating breathlessness. It also has the advantage of preventing the mouth from opening, further preventing snoring and apnea. Furthermore, by providing a low portion 8 that is recessed so as not to compress the cervical vertebrae (the first cervical vertebra C1 to the fourth cervical vertebra C4 in this embodiment) of a person lying on their back, the risk of cervical hernia and cervical spondylosis can be reduced. Furthermore, by providing the middle portion 10 that supports both the left and right sides of the cervical vertebrae of a person lying on their back with the pillow's elastic resilience, the risk of neck stiffness NC can be avoided. In other words, if the area around the cervical vertebrae is not supported at all, the neck NC will become stiff, which not only makes the person more likely to accumulate fatigue but also makes breathing shallower and causes shortness of breath, but this can be prevented by providing the middle portion 10. In this way, the pillow 1 according to this embodiment can improve shortness of breath, prevent neck stiffness, and reduce the risk of cervical hernia or cervical spondylosis, allowing for a comfortable sleep.

[0030] [Regarding technical features (2A) and (2B)] The pillow 1 has the sub-support part 12 set at a lower support height than the main support part 11, the main support part 11 with its higher support height applies pressure to predetermined areas SA7 on the left and right of the occipital bone SA, which faces diagonally downward, to provide planar support, and these predetermined areas SA7 on the left and right that provide planar support are close to the position of the head's center of gravity G, and so on, so that the weight of the head is concentrated on the main support part 11. This concentration prevents the head HD of a person lying on their back from easily starting to move in the vertical direction of the pillow 1, effectively suppressing this from developing into a large shift, and the angle of the head HD of a person lying on their back can be more stably maintained. In other words, it effectively prevents the angle of the head HD of a person lying on their back from easily tilting significantly, which was previously considered difficult. Furthermore, since the areas that are supported by applying pressure in a planar manner with the main support part 11 are the left and right specified areas SA7 of the occipital bone SA, there is no pressure stress and no adverse effect on breathing. In addition, the weight of the head HD of a person lying on their back is concentrated on the main support part 11, causing the main support part 11 to become depressed, which makes it less likely for the head HD of a person lying on their back to roll over (when only the neck NC to the head HD of a person lying on their back rotates laterally to the left and right), and also makes it less likely for a stiff neck to occur.

[0031] 5 is a perspective view of a pillow 1A according to another embodiment of the present invention. As shown in FIG. 5, the pillow 1A has a portion of the front-lower base 3 facing the posterior belly of the digastric muscle PDM of a person lying on their back, i.e., a portion between the left and right sides of the lower portion in the left and right central portion of the front side of the front-lower base 3 (a portion of the front-lower base 3 facing the first cervical vertebra C1 to the fourth cervical vertebra C4, i.e., the left and right central portion of the lower portion in the left and right central portion of the front side of the front-lower base 3, and a portion of the front-lower base 3 facing the left and right sides of the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back, i.e., the left and right central portion of the front side of the front-lower base 3). A cutout 31A is provided to remove the lower portion of the front lower base 3 (the area between the left and right central portion and the left and right side portions of the lower portion of the front lower base 3), and a pair of left and right middle forming bodies 5A made of rectangular plates of elastic urethane foam that are thinner (lower) than the front lower base 3 are adhesively fixed to the left and right sides within this cutout 32 (the area facing the left and right sides of the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back on the front lower base 3, i.e., the area between the left and right central portion and the left and right side portions of the lower portion of the front left and right central portion of the front lower base 3).

[0032] With the above structure, the pillow 1A has a low portion 8A in the area between the pair of left and right middle portion forming bodies 5A (the area facing the first cervical vertebra C1 to the fourth cervical vertebra C4 of the front lower base 3, i.e., the left and right central portion of the lower portion in the left and right central portion of the front side of the front lower base 3).

[0033] In addition, high portions 9A are provided on both the left and right outer sides of the pair of left and right middle portion forming bodies 5A (the portions of the front-lower base 3 facing the posterior belly of the digastric muscle PDM of a person lying on their back, i.e., the left and right sides of the lower portion in the center of the left and right front side of the front-lower base 3).

[0034] Furthermore, a middle portion 10A is provided in the left and right portions of the pair of middle portion forming bodies 5A between these low portions 8A and high portions 9A (the portions facing the left and right sides of the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back on the front lower base 3, i.e., the portion between the left and right central portion and the left and right sides of the lower side of the left and right central portion on the front side of the front lower base 3).

[0035] In the pillow 1A, the front surface of the rear base 2 is exposed at the low portion 8A, but the high portion 9A is provided at the same height as the main support portion 11. Also, the height of the middle portion 10A (middle portion forming body 5A) is gradually decreased from the upper side in the extension direction to the lower side in the height direction, but it may be the same height.

[0036] The pillows 1 and 1A described above are merely examples of the present invention, and the present invention can be implemented by appropriately modifying the structure within the scope of the claims. For example, the shapes, sizes, and hardness of the low parts 8 and 8A, the middle parts 10 and 10A, the high parts 9 and 9A, the main support part 11, the sub-support part 12, the side regulating part 13, the main regulating part 14, etc. of the pillows 1 and 1A can be modified in various ways.

[0037] Furthermore, although the pillows 1 and 1A are constructed by assembling a plurality of parts, it goes without saying that these multiple parts may be integrally molded as much as possible.

[0038] Furthermore, the low parts 8, 8A, middle parts 10, 10A, and high parts 9, 9A of the pillow 1, 1A are provided at the portions facing the neck NC from the first cervical vertebra C1 to the fourth cervical vertebra C4 of a person lying on their back, but of course they may also be provided at the portions facing the neck NC from the first cervical vertebra C1 to the cervical vertebrae above or below the fourth cervical vertebra C4 of a person lying on their back.

[0039] 1 Pillow 8 Low part 9 High part 10 Middle part 11 Main support part 12 Sub-support part

Claims

1. A pillow with elastic resilience, characterized by having a low section that is recessed in the area facing the neck of a person lying on their back so that the elastic resilience of the pillow does not compress the cervical vertebrae of the person lying on their back, a middle section that is higher than this low section and on both sides of the low section supports the left and right sides of the cervical vertebrae of the person lying on their back with the elastic resilience of the pillow, and high sections that are higher than this middle section and on both sides of the middle section press against the posterior belly of the digastric muscle of the person lying on their back with the elastic resilience of the pillow.

2. A pillow with elastic resilience as described in claim 1, characterized in that it is provided with: a main support part on the upper side of the elevated part in the height direction, which has elasticity and applies pressure to at least the area between the upper and lower nuchal lines of the occipital bone of the person lying on their back, from the left end of the part where the trapezius muscle attaches to the occipital bone to the part where the left sternocleidomastoid muscle attaches to the occipital bone, and the area between the right end of the part where the trapezius muscle attaches to the occipital bone to the part where the right sternocleidomastoid muscle attaches to the occipital bone; and a secondary support part on the upper side of the main support part in the height direction, which has elasticity and is set to a support height lower than the main support part, and which applies pressure to support the parietal side of the head of the person lying on their back.

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