The breast is the upper ventral region of the torso of a primate, in left and right sides, which in a female contains the mammary gland that secretes milk used to feed infants.
Both men and women develop breasts from the same embryological tissues. However, at puberty, female sex hormones, mainly estrogen, promote breast development, which does not occur in men, due to the higher amount of testosterone. As a result, women's breasts become far more prominent than those of men.
During pregnancy, the breast is responsive to a complex interplay of hormones that cause tissue development and enlargement in order to produce milk. Three such hormones are estrogen, progesterone and prolactin, which cause glandular tissue in the breast and the uterus to change during the menstrual cycle.
Each breast contains 15–20 lobes. The subcutaneous adipose tissue covering the lobes gives the breast its size and shape. Each lobe is composed of many lobules, at the end of which are sacs where milk is produced in response to hormonal signals.
Read more about Breast: Etymology, Development
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Famous quotes containing the word breast:
“So if hunger provokes wailing and wailing brings the breast; if the breast permits sucking and milk suggests its swallow; if swallowing issues in sleep and stomachy comfort, then need, ache, message, object, act, and satisfaction are soon associated like charms on a chain; shortly our wants begin to envision the things which well reduce them, and the organism is finally said to wish.”
—William Gass (b. 1924)
“There is something in the breast of almost every man, which at bottom takes offense at the attentions of any other man offered to a woman, the hope of whose nuptial love he himself may have discarded. Fain would a man selfishly appropriate all the hearts which have ever in any way confessed themselves his.”
—Herman Melville (1819–1891)