Which muscle that positions the pectoral girdle is a large muscle that covers the back and portions of the neck, inserts on the clavicle and scapula, and has varied actions, due to the fact that specific regions can be made to contract independently?

Function. The function of the serratus anterior muscle is to allow the forward rotation of the arm and to pull the scapula forward and around the rib cage. The scapula is able to move laterally due to the serratus anterior muscle, which is vital for the elevation of the arm.

By placing 2 fingers at the sternum (the spot where the lower ribs meet) the put the heel of your other hand next to your fingers. hope this