![]() This is important because a breast cancer can develop in this axillary tail, even though it might not seem to be located within the actual breast. A tail of breast tissue called the "axillary tail of Spence” extend into the underarm area. ![]() ![]() The breast tissue extends horizontally (side-to-side) from the edge of the sternum (the firm flat bone in the middle of the chest) out to the midaxillary line (the center of the axilla, or underarm). The male breast structure is nearly identical to the female breast, except that the male breast tissue lacks the specialized lobules, since there is no physiologic need for milk production by males.Īnatomically, the adult breast sits atop the pectoralis muscle (the "pec" chest muscle), which is atop the ribcage. These lobules and ducts are spread throughout the background fibrous tissue and adipose tissue (fat) that make up the majority of the breast. Most cancers of the breast arise from the cells which form the lobules and terminal ducts. The epithelial component of the tissue consists of lobules, where milk is made, which connect to ducts that lead out to the nipple. ![]() ![]() The breast is an organ whose structure reflects its special function: the production of milk for lactation (breast feeding). ![]()
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