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pectoralis major (pin)
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The breasts are found anterior to the pectoralis major (what a surprise). Dimpling of the breast, along with firm a lump deep the to dimple(s) upon palpation, may suggest breast cancer. The dimpling in breast cancer is due to shortening of Cooper's (suspensory) ligaments resulting from tumor involvement.
Recall that the the lymph nodes to which this cancer will most likely spread to are the pectoral nodes (aka lateral thoracic or anterior axillary nodes) - these nodes are located along the lateral thoracic artery and, if enlarged, are palpable in the medial wall of the axilla.
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