TOC Dissector Quiz Index Help Upper Extremity Previous Page Next Page Overview
Laboratory 4. Pectoral Region
Step 5. Reflect Pectoralis Major Muscle

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The pectoralis minor muscle is innervated by the medial pectoral nerve. The pectoralis major muscle is innervated by both the medial and lateral pectoral nerve. The medial pectoral nerve may pierce or extend laterally around the pectoralis minor muscle before it passes into the deep surface of the pectoralis major muscle. The lateral pectoral nerve passes medial to the pectoralis minor muscle and pierces the clavipectoral fascia to reach the pectoralis major muscle.

Note: The medial and lateral pectoral nerves are named for the cords of the brachial plexus from which they arise and not for their relationship to
pectoralis minor muscle.

Links and References:
Grant's: 6.14 and 6.15
Netter (1ed.): 174, 175, and 403 (2ed.): 174, 175, and 399
Rohen and Yokochi: 362, 384, and 385