medial pectoral nerve

The medial pectoral nerve is a nerve that innervates the pectoralis muscles, specifically the pectoralis minor and major muscles. These muscles are located in the chest and connect the chest wall to the bones of the upper arm and shoulder. The medial pectoral nerve originates from the brachial plexus, a network of nerves formed by spinal nerves C5 through T1, with contributions from C4 and T2. This plexus provides motor, sensory, and autonomic fibers to the shoulder and upper extremity. The pectoralis major is the larger, superficial muscle, while the pectoralis minor lies beneath it. Together, these muscles are crucial for arm movement, such as adduction and rotation.12