- sternocleidomastoid muscle as a noun:
- 1
sternocleidomastoid muscle
noun
1 sternocleidomastoid muscle
One of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head.
synonyms: musculus sternocleidomastoideus, sternocleido mastoideus, sternocleidomastoid.
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