The male chest, specifically the pectoral region, contains four muscles that act on the upper limb.
Muscles of the Pectoral Region
The pectoral region, located on the anterior chest wall, contains several muscles that influence the movement and stability of the shoulder and arm. These muscles include:
- Pectoralis Major: A large, fan-shaped muscle that is responsible for adduction, flexion, and internal rotation of the arm.
- Pectoralis Minor: A thin, triangular muscle located beneath the pectoralis major. It helps to depress and protract the scapula.
- Serratus Anterior: Located on the lateral aspect of the chest wall, this muscle protracts the scapula and assists in upward rotation of the arm.
- Subclavius: A small muscle located beneath the clavicle that helps to depress the clavicle and stabilize the shoulder joint.
Therefore, the pectoral region, which can be considered the chest, houses these four key muscles.
