What are pectorails major and petorails minor in mammals?

The pectoralis major and pectoralis minor are two muscles located in the chest of mammals. The pectoralis major is a large, thick muscle responsible for the movement of the shoulder joint, aiding in actions such as flexion, adduction, and internal rotation of the arm. The pectoralis minor is smaller and lies underneath the pectoralis major, primarily functioning to stabilize the scapula and assist in movements such as scapular protraction and depression. Together, these muscles play crucial roles in upper limb movement and shoulder stability.