At the ends of the ducts are lobules, or clusters of alveoli, where milk is produced and stored in response to hormonal signals. Subcutaneous fat covers and envelops a network of ducts that converge on the nipple, and these tissues give the breast its size and shape. In females, it serves as the mammary gland, which produces and secretes milk to feed infants.
Both females and males develop breasts from the same embryological tissues. The breast is one of two prominences located on the upper ventral region of a primate's torso.
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