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Cervical Muscles 3D

  • Sternocleidomastoid Muscle
    • * Originates from the posterior border of the sternum and the medial third of the clavicle.
    • * Inserts at the mastoid process of the temporal bone and the superior nuchal line of the occipital bone.
    • * Receives blood supply from branches of the occipital and superior thyroid arteries.
    • * Innervated by the accessory nerve (CN XI) and branches of the cervical plexus (C2 and C3).
    • * Functions to tilt the head to the ipsilateral side when contracted unilaterally, and flexes the neck and elevates the sternum when contracted bilaterally.

 

  • Splenius Capitis Muscle
    • * Originates from the ligamentum nuchae and the spinous processes of C7-T6 vertebrae.
    • * Inserts at the mastoid process of the temporal bone and the lateral superior nuchal line.
    • * Receives blood supply from the occipital artery and deep cervical artery.
    • * Innervated by the dorsal rami of spinal nerves (C2 to C6).
    • * Functions to extend the head and neck when contracted bilaterally, and rotate the head to the contralateral side when contracted unilaterally.

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  • Sternocleidomastoid Muscle
    • * Originates from the posterior border of the sternum and the medial third of the clavicle.
    • * Inserts at the mastoid process of the temporal bone and the superior nuchal line of the occipital bone.
    • * Receives blood supply from branches of the occipital and superior thyroid arteries.
    • * Innervated by the accessory nerve (CN XI) and branches of the cervical plexus (C2 and C3).
    • * Functions to tilt the head to the ipsilateral side when contracted unilaterally, and flexes the neck and elevates the sternum when contracted bilaterally.

 

  • Splenius Capitis Muscle
    • * Originates from the ligamentum nuchae and the spinous processes of C7-T6 vertebrae.
    • * Inserts at the mastoid process of the temporal bone and the lateral superior nuchal line.
    • * Receives blood supply from the occipital artery and deep cervical artery.
    • * Innervated by the dorsal rami of spinal nerves (C2 to C6).
    • * Functions to extend the head and neck when contracted bilaterally, and rotate the head to the contralateral side when contracted unilaterally.

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