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.
Other articles related to "breast, breasts":
... Research failed to establish any noticeable benefit and some phytoestrogens may present a breast cancer risk ... intake in early adolescence may protect against breast cancer later in life ... The potential risks of isoflavones on breast tissue in women at high risk for breast cancer is still unclear ...
... She is making the gesture to cover her left breast, or to turn it with her hand, and is illuminated by a strong artificial light coming from the external ... It has been suggested that the right hand on the left breast reveals a cancerous breast tumour disguised in a classic pose of love ...
... of fat and milk-gland tissues, and the occurrence of breast ptosis ... of laxness of the suspensory Cooper’s ligaments and of the breast skin-envelope (mild, moderate, severe, and pseudo ptosis) — determine the applicable restorative surgical approach for lifting the ... Grade I (mild) breast ptosis can be corrected solely with breast augmentation, surgical and non-surgical ...
... iconography, some works of art depict women with their breasts in their hands or on a platter, signifying that they died as a martyr by having their breasts ...
... Mastopexy (Greek μαστός mastos “breast” + -pēxiā “affix”) is the mammoplasty procedure for correcting the size, contour, and elevation of sagging breasts upon the chest ... In a breast-lift surgery to re-establish an aesthetically proportionate bust for the woman, the critical corrective consideration is the tissue viability of the nipple-areola complex, to ensure the ... The breast-lift correction of a sagging bust is a plastic surgery operation that cuts excess tissues (glandular, adipose, skin), overstretched suspensory ligaments, and ...
Famous quotes containing the word breast:
“The forehead and the little ears
Have gone where Saturn keeps the years;
The breast where roses could not live
Has done with rising and with falling.”
—Edwin Arlington Robinson (18691935)
“morning, at the brown brink eastward, springs
Because the Holy Ghost over the bent
World broods with warm breast and with ah! bright wings.”
—Gerard Manley Hopkins (18441889)
“Getting ready: the show girl scratches her breast and shakes out her feathers.”
—Mason Cooley (b. 1927)