splenius capitis muscle

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sple·ni·us cap·i·tis mus·cle

(splē'nē-ŭs kap'i-tis mŭs'ĕl)
Origin, from ligamentum nuchae of last four cervical vertebrae and supraspinous ligament of first and second thoracic vertebrae; insertion, lateral half of superior nuchal line and mastoid process; action, rotates head and extends neck; nerve supply, dorsal primary rami of second to sixth cervical spinal nerves.
Synonym(s): musculus splenius capitis [TA] , splenius muscle of head.