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Subcutaneous fat covers and envelops a network of ducts that converge on the nipple, and these tissues give the breast its size and shape.

At the ends of the ducts are lobules, or clusters of alveoli, where milk is produced and stored in response to hormonal signals.

The terminal lactiferous ducts drain the milk from TDLUs into 4–18 lactiferous ducts, which drain to the nipple.

The milk-glands-to-fat ratio is 2:1 in a lactating woman, and 1:1 in a non-lactating woman.

As a mammary gland, the breast is composed of differing layers of tissue, predominantly two types: adipose tissue; and glandular tissue, which affects the lactation functions of the breasts.

The breast is an apocrine gland that produces the milk used to feed an infant.

The 2.0–4.5 mm milk ducts are immediately surrounded with dense connective tissue that support the glands.

Milk exits the breast through the nipple, which is surrounded by a pigmented area of skin called the areola.

The Merriam-Webster Dictionary states that "Middle English brest, [comes] from Old English brēost; akin to Old High German brust..., Old Irish brú [belly], [and] Russian bryukho"; the first known usage of the term was before the 12th century.

A large number of colloquial terms for breasts are used in English, ranging from fairly polite terms to vulgar or slang.

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The size of the areola can vary widely among women.

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