The thoracic muscles and breasts are separated by sheets of connective tissue known as fascia.

Figure 1. Fasciae of the breasts (Credit: Adapted from the work of Patrick J. Lynch, CC BY-SA 4.0)

Layers

Fascia is a sheet of connective tissue, containing mostly collagen and its function is to attach, stabilize, enclose, and separates muscles and other internal organs.

Deep to the

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