Two Main Neck Muscles

The two main neck muscles are the sternocleidomastoid and the trapezius, and are responsible for the gross motor movement in the muscular system of the head, neck and shoulders.
The sternocleidomastoid muscle is a paired muscle, located at the front and on each side of the neck. It 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 trapezius is one of the biggest shoulder and neck muscles and the most superficial muscle on the back of the neck and upper trunk. It is a broad, flat triangular muscle that lies just below the skin, covering the upper back part of the neck and shoulders. It links the neck with the spine, ribs,
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