Which of the  following muscles of the head and neck originates on the sternum and clavicle, and inserts on the mastoid process?

A) Scalenes
B) Trapezius
C) Splenius capitis
D) Sternocleidomastoid
E) Semispinalis capitis

Sternocleidomastoid

A muscle in the side of the neck that acts to rotate and flex the head, named for its attachments from the sternum and clavicle to the mastoid process of the temporal bone.

Mastoid Process

A bony prominence located behind the ear, part of the temporal bone, which contains air cells that communicate with the middle ear.

Semispinalis Capitis

Semispinalis capitis is a muscle situated at the back of the neck, extending from the base of the spine to the skull, crucial for head movement and posture.