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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.

Medial pectoral nerve
Nerves of the left upper extremity.gif
Nerves of the left upper extremity. (Medial anterior thoracicvisible in upper right.)
Details
Frommedial cord
Innervatespectoralis minor, pectoralis major
Identifiers
Latinnervus pectoralis medialis
TAA14.2.03.017
FMA65293
Anatomical terms of neuroanatomy

It passes behind the first part of the axillary artery, curves forward between the axillary artery and vein, and unites in front of the artery with a filament from the lateral nerve.

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.

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This article incorporates text in the public domain from page 933 of the 20th edition of Gray's Anatomy (1918)

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