The sternocleidomastoid muscle extends from the mastoid process of the temporal bone to the sternum and medial clavicle. When both sternocleidomastoid muscles contract, the head is flexed. The end of the muscle that connects to the sternum is the __________.
It is the Small point at the end of the sternum that's significantly more narrow and thinner than the rest of the sternal body and consists of cartilage until it gradually turns to bone by the age of 40.
