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Muscles of the thorax and front of the arm.

Muscles of the Arm and Thorax

Muscles of the thorax and front of the arm.

Muscles of the thorax and front of the arm, showing some of the boundaries of the axilla.

Muscles of the Arm and Thorax

Muscles of the thorax and front of the arm, showing some of the boundaries of the axilla.

A frontal view of the chest muscles. 1, sterno-hyoid; 2, sterno-mastoid; 3, sterno-thyroid; 4, sterno-mastoid; 5, trapezius; 6, clavicle; 7, origin pectoralis major; 8, deltoid; 9, lower edge pectoralis major; 10, middle pectoralis major; 11, fibres external oblique; 12, biceps; 13, teres major; 14, serratus major anticus; 15, external oblique interlocking with serratus major.

Chest Muscles

A frontal view of the chest muscles. 1, sterno-hyoid; 2, sterno-mastoid; 3, sterno-thyroid; 4, sterno-mastoid;…

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…