Where is the sternocleidomastoid muscle located?

The sternocleidomastoid muscle is located in the head and neck region. This muscle is prominent on both sides of the neck and plays a critical role in various movements, including the rotation and flexion of the head. It originates from the sternum and clavicle and inserts at the mastoid process of the temporal bone of the skull. Understanding its location and function is essential for recognizing its importance in anatomical studies, clinical assessments, and treatment strategies related to neck and head conditions.