Neck muscles (Cervical S): Suboccipital Muscles

RECTUS CAPITIS POSTERIOR MAJOR

Origin: Spinous process of the C2 vertebra (axis).

Insertion: Lateral part of the inferior nuchal line of the occipital bone.
Innervation: Suboccipital nerve.
Function: Extends the head and assists in head rotation.

RECTUS CAPITIS POSTERIOR MINOR

Origin: Posterior tubercle (rudimentary spinous process) of the C1 vertebra (atlas).
Insertion: Medial part of the inferior nuchal line of the occipital bone.
Innervation: Suboccipital nerve.
Function: Extends the head and may assist in head rotation.

OBLIQUUS CAPITIS SUPERIOR

Origin: Transverse process of the C1 vertebra (atlas).
Insertion: Occipital bone, between the superior and inferior nuchal lines.
Innervation: Suboccipital nerve.
Function: Extends and laterally flexes the head.

OBLIQUUS CAPITIS INFERIOR

Origin: Spinous process of the C2 vertebra (axis).
Insertion: Transverse process of the C1 vertebra (atlas).
Innervation: Suboccipital nerve.
Function: Rotates the atlas and head to the same side.

THE SUBOCCIPITAL TRIANGLE

The suboccipital triangle is an anatomical landmark formed by three of the suboccipital muscles:

Rectus capitis posterior major.
Obliquus capitis superior.
Obliquus capitis inferior.

This triangular region encloses critical structures, including the vertebral artery, suboccipital nerve, and posterior arch of the atlas. The suboccipital triangle is significant for its role in neurovascular supply to the posterior brain and its clinical importance in conditions such as vertebrobasilar insufficiency and cervicogenic headaches.

CLINICAL RELEVANCE

Cervicogenic Headaches: The connective tissue link between the rectus capitis posterior minor and the dura mater may explain the involvement of suboccipital muscles in certain headache types.
Neck Pain and Stiffness: Dysfunction or tightness in the suboccipital muscles can restrict head extension and rotation, leading to pain and limited mobility.
Neurological Symptoms: Compression of the vertebral artery or suboccipital nerve within the suboccipital triangle can result in dizziness, visual disturbances, or impaired blood flow.

The suboccipital muscles play an essential role in the precise control of head movements and in maintaining postural stability. Despite their small size, these muscles have significant functional and clinical importance, emphasizing their role in the musculoskeletal and neurological systems of the cervical spine.

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The NECK Muscles

POSTERIOR PART

THE SUBOCCIPITAL MUSCLES

RECTUS CAPITIS POSTERIOR MAJOR

RECTUS CAPITIS POSTERIOR MINOR

OBLIQUUS CAPITIS SUPERIOR

OBLIQUUS CAPITIS INFERIOR

THE SUBOCCIPITAL TRIANGLE

CLINICAL RELEVANCE

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The NECK Muscles

POSTERIOR PART

THE SUBOCCIPITAL MUSCLES

RECTUS CAPITIS POSTERIOR MAJOR

RECTUS CAPITIS POSTERIOR MINOR

OBLIQUUS CAPITIS SUPERIOR

OBLIQUUS CAPITIS INFERIOR

THE SUBOCCIPITAL TRIANGLE

CLINICAL RELEVANCE

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