
so here's a brief overview! the sternocleidomastoid is a paired muscle acting together to extend and flex the neck; one muscle rotates the head to the opposite side
IT CUTS ME IN HALF
but literally, here's a fun fact: the sternocleidomastoid divides the neck region into anterior (front) and posterior (back) triangles

but literally, here's a fun fact: the sternocleidomastoid divides the neck region into anterior (front) and posterior (back) triangles

ALL FOR SCIENCE