Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The sternocleidomastoid is a major muscle in the neck that plays a vital role in head movement and stabilization. It extends from the sternum and clavicle to the mastoid process of the temporal bone.
Related terms
Mastoid Process: A bony protrusion located behind the ear that serves as an attachment point for neck muscles.
The seven vertebrae forming the upper part of the spine, supporting the neck and allowing for its range of motion.
Muscle Origin and Insertion: Origin refers to where a muscle begins (attached to a fixed bone), and insertion refers to where it ends (attached to a bone that moves during muscle contraction)