The tapering lateral portion of the pectoralis major muscle is the anterior boundary of the axilla. Between the pectoralis major and minor, an interpectoral lymph node (of Rotter) is occasionally found. The cephalic vein is found in the groove between the deltoid and pectoralis major muscles.
The investing layer of deep chest wall fascia encloses the pectoralis major and latissimus muscles and bridges between the two. It is tethered by the underlying clavipectoral fascia, giving the axillary skin its concave contour.
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