ANATOMY

Detailed explanation-1: -The sternocleidomastoid muscle is one of the largest and most superficial cervical muscles. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. The sternocleidomastoid is innervated by the accessory nerve .

Detailed explanation-2: -Function. Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head.

Detailed explanation-3: -Sternocleidomastoid: One of the largest muscles in the neck, helping you move your head, extend your neck and control your temporomandibular joint (in the jaw).

Detailed explanation-4: -The major muscle that laterally flexes and rotates the head is the sternocleidomastoid.

Detailed explanation-5: -The sternocleidomastoids (SCMs) are superficially located neck muscles that play an important role in tilting your head and turning your neck, as well as other movements. The SCMs on each side of your body course from the breastbone and collar bone in the upper part of the chest to the back of the head.