A triangular muscle in the upper part of the back and the neck, which moves the shoulder blade and pulls the head back.
Large, flat triangular muscle of the shoulder and upper back region involved in movement of the shoulder and arm.
A flat triangular muscle covering the back of the neck and shoulder. It is important for movements of the scapula and it also draws the head backward to either side.
Muscle that covers the back of the neck and upper and middle region of the back; rotates and controls swinging movements of the arm.