Semispinalis Thoracis Muscle
Splenius Capitis Muscle
a. Inferior half of ligamentum nuchae (C3-C6) and spinous processes of C7-T3 (possibly down to T6)
a. Superior nuchal line of occipital bone and mastoid process of temporal bone
Actions of the Splenius Capitis Muscle
a. Bilaterally extends head and neck.
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b. Unilaterally laterally flexes head and neck to same side.
c. Unilaterally rotates head and neck to same side.
Nerve to the Splenius Capitis Muscle
a. Dorsal primary rami of spinal nerves C2-C6.