The pectoralis minor is a small muscle located on the front of the upper chest that is covered by the pectoralis major. The pectoralis minor is involved in depression and abduction. In depression it works together with the lower trapezius, and in abduction it works together with the serratus anterior.
The pectoralis minor originates from the outer surfaces of the third, fourth, and fifth ribs.
The pectoralis minor inserts at the end of the coracoid.
Lowers the shoulder girdle.