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The medial pectoral nerve (medial anterior thoracic) 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 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. A mnemonic to differentiate the medial pectoral nerve, which pierces both the pectoralis minor and the sternocostal head of the pectoralis major, from the lateral pectoral nerve, which pierces only the clavicular head of the pectoralis major, is "Lateral Less, Medial More". ==See also== * Lateral pectoral nerve 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「medial pectoral nerve」の詳細全文を読む スポンサード リンク
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