musculus sternocleidomastoideus
n 1: 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 [syn:
{sternocleidomastoid}, {sternocleidomastoid muscle},
{sternocleido mastoideus}, {musculus
sternocleidomastoideus}]