semispinal muscle of head sem·i·spi·nal muscle of head (sěm’ē-spī’nəl, sěm’ī-)
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.
- Semispinal muscle of neck
semispinal muscle of neck n. A muscle continuous with the semispinal muscle of the thorax, with origin from the second to the fifth thoracic vertebrae, with insertion into the axis and the third to the fifth cervical vertebrae, with nerve supply from the dorsal branches of the cervical and thoracic nerves, and whose action extends […]
- Semispinal muscle of thorax
semispinal muscle of thorax n. A muscle with origin from the fifth to the eleventh thoracic vertebrae, with insertion into the first four thoracic vertebrae and the fifth and seventh cervical vertebrae, with nerve supply from the dorsal branches of the cervical and the thoracic nerves, and whose action extends the vertebral column.
[sem-ee-stahr-vey-shuh n, sem-ahy-] /ˌsɛm i stɑrˈveɪ ʃən, ˌsɛm aɪ-/ noun 1. the state of being nearly starved.
[sem-ee-suh b-mur-suh-buh l, sem-ahy-] /ˌsɛm i səbˈmɜr sə bəl, ˌsɛm aɪ-/ noun 1. Also called semisubmersible rig. a self-propelled barge that is mounted on partially submerged legs supported by underwater pontoons, rides at anchor, and serves as a work base and living quarters in deep offshore drilling operations. adjective 2. of, for, or pertaining to […]