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.

Why  do you think body composition focuses  on the  ratio  of  fatty tissue  to  other body tissue? why is  body composition not related  to  weight?