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On each side of the thorax, pectoralis major is an important muscular link to the upper arm. It is thick, triangular in shape and forms the anterior wall of the axilla. In the female, it is covered by the breast which is attached to the pectoral fascia.
It originates and inserts as two main groups of fibres which usually are separated by a groove:
Pectoralis major is innervated by the medial (C8, T1) and lateral (C5, C6, C7) pectoral nerves. Its key actions include medial rotation and adduction of the arm. Its accessory functions and testing are considered in the submenu.
Last reviewed 01/2018
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