Pectoralis minor is a triangular-shaped muscle that lies deep to pectoralis major on each side of the thorax. It forms part of the anterior wall of the axilla. Anatomically, it provides a lanmark to deeper structures, notably the axillary artery and cords of the brachial plexus.
It originates from the:
After passing superolaterally, it forms a tendon which inerts into the medial and superior surfaces of the coracoid process of the scapula.
It is mainly supplied by the medial pectoral nerve which passes through it. However, it receives also a motor supply from the lateral pectoral nerve. The combined root level is C6, C7 and C8.
The main actions of pectoralis minor are:
Testing pectoralis minor is difficult as it cannot be palpated through pectoralis (and the breast in females).
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