sternocleidomastoid
noun
variants:
or sternocleidomastoid muscle
Definition of sternocleidomastoid
: a thick superficial muscle on each side of the neck that arises by one head from the first segment of the sternum and by a second from the inner part of the clavicle, that inserts into the mastoid process and occipital bone, and that acts especially to bend, rotate, flex, and extend the head
— called also sternomastoid
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