Because the Pectoral Muscles belong to the anterior wall of the axilla, they must be supplied by anterior cords (ie, lateral and medial cords). The branch from the lateral cord is the lateral pectoral nerve (lateral anterior thoracic n.). The branch from the medial cord, the medial pectoral nerve (medial anterior thoracic n.), pierces the Pectoralis Minor and supplies it and the lower half of the Pectoralis Major.
Surgical Anatomy. Arch Surg. 1995;130(12):1320. doi:10.1001/archsurg.1995.01430120074011
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