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one of the folds of skin and muscular tissue bounding the axilla anteriorly and posteriorly.
Synonym(s): plica axillaris
Two ridges of skin-covered muscle along the sides of the chest where the under side of each arm meets the shoulder. The anterior axillary fold is formed by the lateral edge of the pectoralis major muscle; the posterior axillary fold is formed by the lateral edges of the latissimus dorsi and teres major muscles.
See also: fold