sternocleidomastoid muscle n.
A muscle with origin from the anterior surface of the episternum and from the sternal end of the clavicle, with insertion into the mastoid process and the superior nuchal line, with nerve supply from the accessory nerve, and whose action turns the head obliquely to the opposite side and flexes the neck and extends the head when both sides act together. Also called sternomastoid muscle.
- Sternocleidomastoid vein
sternocleidomastoid vein n. A vein that arises in the sternocleidomastoid muscle and drains into the internal jugular vein.
[stur-noh-kos-tl, -kaw-stl] /ˌstɜr noʊˈkɒs tl, -ˈkɔ stl/ adjective, Anatomy, Zoology. 1. of, relating to, or situated between the sternum and ribs. sternocostal ster·no·cos·tal (stûr’nō-kŏs’təl) adj. Of or relating to both the sternum and the ribs.
sternodynia ster·no·dyn·i·a (stûr’nō-dĭn’ē-ə) n. See sternalgia.
- Sternohyoid muscle
sternohyoid muscle ster·no·hy·oid muscle (stûr’nō-hī’oid’) n. A muscle with origin from the episternum and the first costal cartilage, with insertion into the hyoid bone, with nerve supply from the upper cervical nerve through the cervical ansa, and whose action depresses the hyoid bone.