#MuscleMonday! This is the Serratus Anterior. Fixed to the surfaces of upper 8 or 9 ribs at the side of chest, as well as the vertebral border of scapula.
It draws scapula forward and upward; abducts scapula (lifts away from the body) and rotates it; and stabilizes vertebral border of scapula.
Occasionally referred to as the “boxer’s muscle” because it is largely responsible for pulling the scapula forward and around the rib cage; that action when someone throws a punch. This muscle can also lift the rib cage, when the shoulder is isolated, which assists with respiration.