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The Sternocleidomastoid Muscle is one of the most prominent and powerful muscles of the neck. It functions in head rotation, neck flexion, and assists in respiration. It is innervated by the accessory nerve (CN XI) and serves as a key anatomical landmark in defining the boundaries of the neck. Anatomical Structure Morphology and Attachment Points The sternocleidomastoid muscle is a strong, superficial muscle located in the anterolateral region of the neck. It has two heads: the sternal head orig