Semispinal muscle of head



semispinal muscle of head sem·i·spi·nal muscle of head (sěm’ē-spī’nəl, sěm’ī-)
n.
A muscle with origin from the five or six upper thoracic vertebrae and the four lower cervical vertebrae, with insertion into the occipital bone, with nerve supply from the dorsal branches of the cervical nerve, and whose action rotates the head and draws it backward.

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