sternocleidomastoid sternocleidomastoid muscle sternocleido mastoideus musculus sternocleidomastoideus
sternocleidomastoid%1:08:00:: sternocleidomastoid_muscle%1:08:00:: sternocleido_mastoideus%1:08:00:: musculus_sternocleidomastoideus%1:08:00::
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