Ventral arm and chest
Skeletal_muscles are named using these criteria: the direction of the muscle fibers, the relative size of the muscle, the location of the muscle, the number of origins, the location of the origin and insertion, the shape of the muscle and the specific action that the muscle performs.
There are various types of skeletal muscle actions, including prime_movers (agonists), antagonists, synergists, and fixators.
(1) Humans have two pectoralis_muscles, but cats have four: pectoantebrachialis, pectoralis_major, pectoralis_minor, and xiphihumeralis.
(2) The pectoralis minor is actually larger than the pectoralis major. There is no pectoantebrachialis in humans.