Dominic Stone
The suboccipital muscles are a group of four muscles located in the posterior region of the neck, underneath the occipital bone. These muscles are responsible for maintaining posture and enabling movements of the head, such as extension, lateral flexion, and rotation. They are clinically important due to their proximity to the vertebral artery and are often associated with conditions like suboccipital syndrome and cervicogenic headaches. The suboccipital triangle, formed by three of these muscles, is a significant anatomical landmark in the posterior neck region.
| Characteristics | Values |
|---|---|
| Number of muscles | 4 |
| Muscle names | Rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior |
| Muscle attachments | Rectus capitis posterior major originates from the spinous process of the C2 vertebra and attaches to the occipital bone. Rectus capitis posterior minor originates from the posterior tubercle of the C1 vertebra and attaches to the occipital bone. Obliquus capitis superior originates from the transverse process of the C1 vertebra and attaches to the occipital bone. Obliquus capitis inferior originates from the spine of the C2 vertebra and attaches to the transverse process of the C1 vertebra. |
| Innervation | Suboccipital nerve (posterior ramus of C1) |
| Main function | Postural support of the head and neck, allowing for extension and rotation movements |
| Clinical importance | Involved in the pathogenesis of cervicogenic headaches due to their connections with the dura mater. Tension in these muscles can cause headaches, dizziness, loss of balance, and ataxia. |
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What You'll Learn
The suboccipital muscles are a group of four muscles
The suboccipital muscles are innervated by the suboccipital nerve, which is formed by the dorsal ramus of C1. They are supplied by the vertebral artery and the deep descending branches of the occipital artery. Their main function is to provide postural support to the head and neck, allowing for movements such as extension, lateral flexion, and rotation of the atlanto-axial joints. The suboccipital triangle is an important anatomical landmark that localizes the vertebral artery and suboccipital nerve. It is formed by the rectus capitis posterior major and both obliquus capitis muscles. This trio provides fine motor function in movements of the head.
Distortion, tightness, and shifting of the spine due to suboccipital muscles can lead to gait disturbances, dizziness, loss of balance, and ataxia. Suboccipital muscle tension can cause pain at the base of the skull, in the forehead, and behind the eyes. It has also been implicated in the development of cervicogenic headaches due to their connection with the dura mater.
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They are located underneath the occipital bone
The suboccipital muscles are a group of four muscles situated underneath the occipital bone. They are located within the suboccipital compartment of the neck, deep to the sternocleidomastoid, trapezius, splenius, and semispinalis muscles. These muscles collectively act to extend and rotate the head.
The suboccipital region is shaped like an upside-down pyramid and is located inferior to the occipital bone, including the external occipital protuberance and the inferior nuchal line. These are anatomical landmarks on the occipital bone of the skull. The suboccipital muscles are the only group of muscles within this region that has no attachment to the cranium.
The four suboccipital muscles are:
- Rectus capitis posterior major: This muscle originates from the spinous process of the C2 vertebrae (axis) and inserts into the lateral part of the inferior nuchal line of the occipital bone.
- Rectus capitis posterior minor: This muscle originates from the posterior tubercle (a rudimentary spinous process) of the C1 vertebra and attaches to the medial part of the inferior nuchal line of the occipital bone.
- Obliquus capitis superior: This muscle originates from the transverse process of the C1 vertebra and attaches to the occipital bone between the superior and inferior nuchal lines.
- Obliquus capitis inferior: This muscle is the smallest of the suboccipital muscles and originates from the spine of the C2 vertebra, attaching to the transverse process of the C1 vertebra.
The main function of the suboccipital muscles is to provide postural support for the head and neck. They assist in movements such as extension, lateral flexion, and rotation of the atlanto-axial joints. These muscles are innervated by the suboccipital nerve and supplied by the vertebral artery.
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They are responsible for posture and head movement
The suboccipital muscles are a group of four muscles situated underneath the occipital bone, at the base of the skull where it meets the neck. These four muscles are the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior.
These muscles are responsible for maintaining the posture of the head and neck, and also enable movements such as extension, lateral flexion, and rotation of the atlanto-axial joints. The suboccipital muscles are postural muscles that provide fine motor function in movements of the head. They collectively act to extend and rotate the head.
The rectus capitis posterior major is the larger of the rectus capitis muscles and is located laterally to the rectus capitis posterior minor. It originates from the spinous process of the C2 vertebrae (axis) and inserts into the lateral part of the inferior nuchal line of the occipital bone. The rectus capitis posterior minor is the most medial of the suboccipital muscles. It originates from the posterior tubercle of the C1 vertebra and attaches to the medial part of the inferior nuchal line of the occipital bone.
The obliquus capitis superior is located laterally in the suboccipital compartment. It is smaller than the obliquus capitis inferior and originates from the transverse process of the atlas (C1 vertebra). It attaches to the occipital bone between the superior and inferior nuchal lines. The obliquus capitis inferior is the only suboccipital muscle that does not attach to the cranium. Instead, it inserts into the transverse process of the atlas. It originates at the posterior tubercle of the posterior arch of the axis (C2 vertebra).
Distortion, tightening, and shifting of the spine caused by the suboccipital muscles can negatively impact posture, gait, balance, and the nervous system.
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They form a suboccipital triangle
The suboccipital muscles are a group of four muscles situated underneath the occipital bone. These muscles are located within the suboccipital compartment of the neck, deep to the semispinalis capitis muscle, and other neck muscles such as the sternocleidomastoid, trapezius, and splenius. The four muscles are:
- Rectus capitis posterior major
- Rectus capitis posterior minor
- Obliquus capitis superior
- Obliquus capitis inferior
Three of these four muscles contribute to forming the boundaries of the suboccipital triangle: rectus capitis posterior major, obliquus capitis inferior, and obliquus capitis superior. The suboccipital triangle is an area bordered by these three suboccipital muscles. The vertebral artery, suboccipital venous plexus, and suboccipital nerve are all contained within the suboccipital triangle. The vertebral artery and suboccipital nerve are particularly important anatomic landmarks for surgeons operating in the posterior cervical region to avoid life-threatening bleeding.
The suboccipital muscles are responsible for maintaining posture and enabling movements of the head, such as extension, lateral flexion, and rotation of the atlanto-axial joints. They also play a role in cervicogenic headaches due to their connections with the dura mater.
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They are innervated by the suboccipital nerve
The suboccipital muscles are a group of four muscles located in the posterior region of the neck, underneath the occipital bone. These muscles are responsible for maintaining posture and enabling movements of the head, such as extension, lateral flexion, and rotation of the atlanto-axial joints.
The suboccipital muscles play a crucial role in relaying information to the brain about the position of the head in space. They contribute to fine motor function and movements of the head. These muscles are closely associated with the vertebral artery and are important in surgical access to the posterior cranial fossa.
The suboccipital muscles are innervated by the suboccipital nerve, also known as the posterior ramus of the first cervical nerve or spinal nerve C1. This nerve travels between the cranium and the atlas before coursing within the suboccipital region alongside the vertebral artery. The suboccipital nerve provides innervation to the suboccipital muscles but not to the overlying skin.
The four suboccipital muscles that are innervated by the suboccipital nerve include:
- Rectus capitis posterior major: This muscle originates from the spinous process of the C2 vertebrae and inserts into the lateral part of the inferior nuchal line of the occipital bone.
- Rectus capitis posterior minor: This muscle originates from the posterior tubercle of the C1 vertebra and attaches to the medial part of the inferior nuchal line of the occipital bone.
- Obliquus capitis superior: This muscle originates from the transverse process of the C1 vertebra and attaches to the occipital bone between the superior and inferior nuchal lines.
- Obliquus capitis inferior: This muscle is unique in that it does not attach to the cranium. Instead, it inserts into the transverse process of the atlas. It originates from the posterior tubercle of the posterior arch of the axis.
Distortions, tightness, and shifting of these suboccipital muscles can have negative consequences, such as disturbances in gait, dizziness, loss of balance, and ataxia, a degenerative disease of the nervous system. Additionally, trigger points in the suboccipital muscles can result in tension headaches, causing pain in the temporal and occipital regions.
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Frequently asked questions
Suboccipital muscles are a group of four muscles located in the posterior region of the neck, underneath the occipital bone. They are responsible for maintaining posture and enabling neck movements such as extension and rotation of the head.
The four suboccipital muscles are: rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior.
The primary function of the suboccipital muscles is to provide postural support to the head and neck. They also facilitate movements such as extending and rotating the head. Additionally, these muscles are clinically important due to their proximity to the vertebral artery and their role in certain pathologies, such as cervicogenic headaches.
The suboccipital muscles are located in the suboccipital region, inferior to the external occipital protuberance and the inferior nuchal line. This region is situated at the base of the skull, where the skull meets the top two vertebrae (C1 and C2).
Tension in the suboccipital muscles can be relieved through chiropractic care, gentle adjustments, and stretching. Dr. Pat Walsh recommends using simple techniques with your knuckles, thumb, or a flat surface to ease discomfort and improve mobility in the upper cervical spine.
