Pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. For example, they may include muscles like pectoralis major or latissimus dorsi. It is palpable in the deltopectoral groove between the deltoid and pectoralis major muscles. The lateral pectoral nerve is distributed over the deep surface of the pectoralis major. The pectoralis major muscles are then detached from the sternum. Pectoralis major muscle in rare occasions may develop intramuscular lipomas. Hypertrophy of the pectoralis major increases functionality. The pectoralis minor muscle is larger than the pectoralis major. However, most of its anterior border is covered by the pectoralis major. Beneath the pectoralis major is the pectoralis minor, a thin, triangular muscle. It is smaller than the pectoralis minor muscle. The pectoralis and supracoracoideus muscles are greatly reduced. Another condition that may be confused with gynecomastia is enlargement of the pectoralis muscles. Maximal activation of the pectoralis major occurs in the transverse plane through pressing motions. Axillary nodes are classified according to their positions relative to the pectoralis minor muscle.