The sternocleidomastoid muscle or “scm” is a strap like muscle located in the front of the neck. It originates on the manubrium of the sternum and the medial clavicle, and inserts on the mastoid process of the temporal bone( the lump or bone behind the ear). When working together the scm flexes the head and neck. The actions of one muscle working by itself is to rotate the face to the opposite side and lift it toward the ceiling.
Trigger points in this muscle usually form due to acute injury or to chronic postural stress. These trigger points can cause a wide variety of symptoms including pain felt in the cheek, temple, forehead, top of the head, and base of the skull. Trigger points in these muscles can also refer deep into the ear and cause postural dizziness.