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Diagram of the origin and distribution of the nerves to the pectoral muscles. E.A.T., external thoracic nerve; I.A.T., internal anterior thoracic nerve; C.5, 6, 7, C.8, T.1, nerves of the brachial plexus; ART., axillary artery; CL, clavicle; SCL., subclavius muscle; P.Mr, pectoralis minor, joined to subclavius by costocoracoid membrane; P.MA, pectoralis major.

Nerves of the Pectoral Muscles

Diagram of the origin and distribution of the nerves to the pectoral muscles. E.A.T., external thoracic…

Front view of the body, showing deep muscles.

Deep Muscles of the Trunk of the Body

Front view of the body, showing deep muscles.