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However, milk production is blocked by the hormones progesterone and estrogen until after delivery, when progesterone and estrogen levels plummet. This condition of asymmetry is transitory and statistically normal in female physical and sexual development. For pubescent girls in thelarche the breast-development stage , the female sex hormones principally estrogens in conjunction with growth hormone promote the sprouting, growth, and development of the breasts. During sexual arousal , breast size increases, venous patterns across the breasts become more visible, and nipples harden. Lactation unrelated to pregnancy is known as galactorrhea. They are sensitive to the touch as they have many nerve endings; and it is common to press or massage them with hands or orally before or during sexual activity.

Xnx south africa

Approximately two years after the onset of puberty a girl's first menstrual cycle , estrogen and growth hormone stimulate the development and growth of the glandular fat and suspensory tissues that compose the breast. Plastic surgery Conventional mastectomy top ; skin sparing mastectomy and latissimus dorsi myocutaneous flap reconstruction, prior to nipple reconstruction and tattooing bottom. The size of the areola can vary widely among women. Society and culture General In Christian 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 severed; one example of this is Saint Agatha of Sicily. Body image Many women regard their breasts as important to their sexual attractiveness , as a sign of femininity that is important to their sense of self. The nipple of the breast is surrounded by the areola nipple-areola complex. High levels of oxytocin trigger the contraction of muscle cells surrounding the alveoli, causing milk to flow along the ducts that connect the alveoli to the nipple. As a mammary gland , the breast is composed of differing layers of tissue , predominantly two types: The chest thoracic cavity progressively slopes outwards from the thoracic inlet atop the breastbone and above to the lowest ribs that support the breasts. Puberty Five-stage Tanner Scale The morphological structure of the human breast is identical in males and females until puberty. In addition to the milk glands, the breast is also composed of connective tissues collagen , elastin , white fat, and the suspensory Cooper's ligaments. The adipose tissue and milk glands also begin to wither. The popular adoration of female goddesses decreased significantly during the rise of the Greek city states, a legacy which was passed on to the later Roman Empire. Plastic surgery can be performed to augment or reduce the size of breasts, or reconstruct the breast in cases of deformative disease, such as breast cancer. The legend was a popular motif in art during Greek and Roman antiquity and served as an antithetical cautionary tale. Breast cancer Breast cancer is the most common cause of cancer death among women [29] and it is one of the leading causes of death among women. Normal breast tissue typically has a texture that feels nodular or granular, to an extent that varies considerably from woman to woman. Breast development The breasts are principally composed of adipose, glandular , and connective tissues. Mammoplasia breast enlargement in girls begins at puberty, unlike all other primates in which breasts enlarge only during lactation. At the sides of the chest, the breast tissue can extend into the axilla armpit , and can reach as far to the back as the latissimus dorsi muscle , extending from the lower back to the humerus bone the longest bone of the upper arm. During sexual arousal , breast size increases, venous patterns across the breasts become more visible, and nipples harden. Lactation in newborns is caused by hormones from the mother that crossed into the baby's bloodstream during pregnancy. Skin In women, the breasts overlie the pectoralis major muscles and usually extend from the level of the second rib to the level of the sixth rib in the front of the human rib cage ; thus, the breasts cover much of the chest area and the chest walls. A typical example is the so-called Venus of Willendorf , one of many Paleolithic Venus figurines with ample hips and bosom. Women in art were covered in clothing from the neck down, including female goddesses like Athena , the patron of Athens who represented heroic endeavor. The T-4 nerve Thoracic spinal nerve 4 , which innervates the dermatomic area , supplies sensation to the nipple-areola complex.

Xnx south africa

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27.11.2017 at 10:12 pm

However, milk production is blocked by the hormones progesterone and estrogen until after delivery, when progesterone and estrogen levels plummet. The breast is positioned, affixed to, and supported upon the chest wall, while its shape is established and maintained by the skin envelope.

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