Which muscle originates on the mastoid process and terminates on the sternum?

The muscle that originates on the mastoid process and terminates on the sternum is the sternocleidomastoid. This muscle is a prominent neck muscle that plays a crucial role in head movement and stabilization. Its name provides insight into its attachment points: "sterno" refers to the sternum, "cleido" pertains to the clavicle, and "mastoid" refers to the mastoid process of the temporal bone, where it starts.

The sternocleidomastoid muscle allows for rotation and flexion of the head. When both sides contract simultaneously, it can help flex the neck. When just one side contracts, it turns the head towards the opposite side.

Understanding the anatomical relationships and functions of the sternocleidomastoid enhances knowledge of how certain movements occur in the head and neck area, which is integral in chiropractic practice and patient care.