|Medial pectoral nerve|
Nerves of the left upper extremity. (Medial anterior thoracicvisible in upper right.)
|Innervates||pectoralis minor, pectoralis major|
|Latin||nervus pectoralis medialis|
|Anatomical terms of neuroanatomy|
The medial pectoral nerve (also known as the medial anterior thoracic nerve) arises from the medial cord (sometimes directly from the anterior division of the inferior trunk) of the brachial plexus and through it from the eighth cervical and first thoracic roots.
It then enters the deep surface of the pectoralis minor muscle, where it divides into a number of branches, which supply the muscle.
Two or three branches pierce the muscle and end in the sternocostal head of the pectoralis major muscle. The medial pectoral nerve pierces both the pectoralis minor and the sternocostal head of the pectoralis major. The lateral pectoral nerve pierces only the clavicular head of the pectoralis major.