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The suboccipital muscles are a group of four muscles located underneath the occipital bone, at the base of the skull where it meets the neck. 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 implicated in conditions like cervicogenic headaches and suboccipital syndrome, which can cause pain in the neck, skull, forehead, and behind the eyes. Understanding the anatomy and function of the suboccipital muscles is crucial for both chiropractic care and surgical approaches to various cranial pathologies.
| Characteristics | Values |
|---|---|
| Number of muscles | 4 |
| Muscle names | Rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior |
| Muscle type | Postural muscles |
| Muscle movement | Extension, lateral flexion, and rotation of the atlanto-axial joints |
| Innervation | Suboccipital nerve |
| Artery | Vertebral artery |
| Nerve | Posterior ramus of the first cervical nerve/spinal nerve C1 |
| Location | Inferior to the occipital bone, at the base of the skull where it meets the neck |
| Shape | Pyramidal |
| Syndrome | Suboccipital syndrome, causing pain in the posterior neck and skull |
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What You'll Learn
- Suboccipital muscles are located underneath the occipital bone
- They are made up of four pairs of small muscles
- The muscles assist in head extension, lateral flexion and rotation
- Suboccipital syndrome can occur due to muscle shortening or spasms
- They are supplied by the vertebral artery and occipital artery branches
Suboccipital muscles 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. The suboccipital region is a pyramid-shaped muscle compartment, inferior to the external occipital protuberance and deep to the superior part of the posterior cervical region. These muscles are responsible for maintaining posture and facilitating movements of the head, such as extension, lateral flexion, and rotation at the atlanto-axial joints.
The four suboccipital muscles include the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior. The rectus capitis posterior major is the larger of the rectus capitis muscles and originates from the spinous process of the C2 vertebrae, inserting into the lateral part of the inferior nuchal line of the occipital bone. The rectus capitis posterior minor, the most medial of the suboccipital muscles, 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 originates from the transverse process of the C1 vertebra and attaches to the occipital bone between the superior and inferior nuchal lines. The obliquus capitis inferior is the most inferiorly positioned of the suboccipital muscles. It originates from the spinous process of the C2 vertebra and inserts into the transverse process of the atlas.
The suboccipital muscles are innervated by the suboccipital nerve, which is formed by the posterior ramus of the first cervical nerve (C1). They are supplied by the vertebral artery and the deep descending branches of the occipital artery. The suboccipital triangle, an area bordered by three of the suboccipital muscles, contains the vertebral artery and the suboccipital nerve. Suboccipital syndrome is a disorder characterised by muscle shortening or spasms in this region, often due to poor posture, causing pain in the posterior neck and skull.
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They are made up of four pairs of small muscles
The suboccipital muscles are a group of four muscles situated underneath the occipital bone. They are made up of four pairs of small muscles, namely:
- Rectus capitis posterior major
- Rectus capitis posterior minor
- Obliquus capitis superior
- Obliquus capitis inferior
These four muscles contribute to the overall functions of the suboccipital muscles, but each has its own distinct role. The first three muscles listed above form the boundaries of an area known as the suboccipital triangle, which is a region of the posterior neck containing the vertebral artery and the suboccipital nerve. The suboccipital triangle provides fine motor function in movements of the head.
The rectus capitis posterior major is the larger of the rectus capitis muscles and originates from the spinous process of the C2 vertebrae (axis). It inserts into the lateral part of the inferior nuchal line of the occipital bone. The rectus capitis posterior minor, on the other hand, is the most medial of the suboccipital muscles. It 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.
The obliquus capitis superior is located laterally in the suboccipital compartment. It originates from the transverse process of C1 and attaches to the occipital bone between the superior and inferior nuchal lines. The obliquus capitis inferior is the most inferiorly positioned of the suboccipital muscles. It originates from the spine of the axis vertebra (C2) and inserts into the transverse process of the atlas (C1).
The main function of the suboccipital muscles is to maintain posture, but they also assist in movements such as extension, lateral flexion, and rotation of the atlanto-axial joints. These muscles are clinically important due to their close relationship with the vertebral artery and their role in providing surgical access to the posterior cranial fossa.
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The muscles assist in head extension, lateral flexion and rotation
The suboccipital muscles are a group of four muscles located in the posterior region of the neck, underneath the occipital bone. These muscles are the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior.
These muscles play a crucial role in maintaining posture and facilitating head movements. Specifically, they enable head extension, lateral flexion, and rotation at the atlanto-axial joints.
The rectus capitis posterior major and rectus capitis posterior minor muscles contribute to head extension and rotation to the ipsilateral side. The rectus capitis posterior major is the larger of the two rectus capitis muscles and originates from the spinous process of the C2 vertebrae, inserting 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 and has its origin at the posterior tubercle of the posterior arch of the atlas. It attaches to the medial part of the inferior nuchal line of the occipital bone.
The obliquus capitis superior muscle is responsible for head extension and lateral flexion. It originates from the transverse process of the atlas and attaches to the occipital bone between the superior and inferior nuchal lines. The obliquus capitis superior is located laterally in the suboccipital compartment.
The obliquus capitis inferior muscle facilitates head rotation to the ipsilateral side. It is the most inferiorly positioned of the suboccipital muscles and does not attach to the cranium. Instead, it originates from the posterior tubercle of the posterior arch of the axis and inserts into the transverse process of the atlas.
The suboccipital muscles receive their nerve supply from the suboccipital nerve (posterior ramus of C1), a branch of the first cervical nerve. They are also vascularised by the vertebral artery and its muscular branches, ensuring adequate blood flow to these important muscles.
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Suboccipital syndrome can occur due to muscle shortening or spasms
The suboccipital muscles are a group of four muscles located underneath the occipital bone, at the base of the skull. These muscles are defined by their location to the occiput and are responsible for maintaining posture and facilitating head movements. They include the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior.
Suboccipital syndrome is a disorder that can occur when the suboccipital muscles shorten or spasm. This condition may arise from poor posture or underlying spinal degeneration. The syndrome causes pain in the posterior neck and skull, radiating to the side of the head and behind the eye. Treatment options vary depending on the patient but often involve addressing tension headaches, which are common in individuals with suboccipital syndrome.
The rectus capitis posterior major and minor muscles are involved in extending and rotating the head to the ipsilateral side. The rectus capitis posterior minor is the most medial of the suboccipital muscles and originates from the posterior tubercle of the C1 vertebra, attaching to the occipital bone.
The obliquus capitis superior and inferior muscles contribute to head extension and lateral flexion. The obliquus capitis superior originates from the transverse process of the C1 vertebra and attaches to the occipital bone. The obliquus capitis inferior is unique among the suboccipital muscles as it does not attach to the cranium. Instead, it inserts into the transverse process of the atlas.
These muscles play a crucial role in stabilising the head and neck, providing sensory input, and influencing vestibular and balance functions. Their health is essential for maintaining overall well-being and preventing conditions like suboccipital syndrome, which can cause significant discomfort.
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They are supplied by the vertebral artery and occipital artery branches
The suboccipital muscles are a group of four muscles located underneath the occipital bone. These muscles are the rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior. These muscles are responsible for extending and rotating the head.
The suboccipital muscles are supplied by the vertebral artery and the occipital artery branches. The vertebral artery is a vital component of the vertebrobasilar vascular system, supplying blood to the upper spinal cord, brainstem, cerebellum, and posterior part of the brain. It also provides branches to the surrounding musculature via the anterior spinal arteries. The vertebral artery enters the skull through the foramen magnum and joins with its counterpart to form the basilar artery, which is the main blood supply to the brainstem.
The occipital artery, on the other hand, originates from the external carotid artery and supplies several muscles in the posterior neck, including the trapezius, sternocleidomastoid, and occipitofrontalis muscles. It also gives off meningeal branches to the dura mater and cutaneous branches to the skin of the neck, auricle, and occipital region of the head. The occipital artery also provides muscular penetrating branches.
The combination of blood supply from both the vertebral artery and the occipital artery branches ensures that the suboccipital muscles receive adequate oxygenation and nutrition to function properly, allowing for smooth and coordinated movements of the head and neck.
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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 posture and movements between the skull and top vertebrae.
The four suboccipital muscles are: rectus capitis posterior major, rectus capitis posterior minor, obliquus capitis superior, and obliquus capitis inferior.
The main function of the suboccipital muscles is to maintain posture and assist in movements of the head, including extension, lateral flexion, and rotation at the atlanto-axial joints. They also play a role in fine motor function and proprioception, the sense of self-movement and body position.
