Question

which one of the following is the insertion point for the sternocleidomastoid muscle?
sternum
clavicle
platysma
mastoid process of the temporal bone

Explanation:

The sternocleidomastoid muscle has its insertion point at the mastoid process of the temporal bone. The sternum and clavicle are the origin points of this muscle. The platysma is a different muscle altogether.

Answer:

Mastoid process of the temporal bone.