03-Sein:Development, continued
Breasts, from puberty to adolescence
It should be noted that it is not possible to establish clearly the precise moment at which each girl commence.sa.puberté because of the relative age of maturation of the central nervous system that must give the kick-off. In fact, the generally accepted limits vary between 11 and 14 years and puberty is due to the maturation of the central nervous system which results in the disappearance of the brake inhibiting the hypothalamus. Once this inhibition is lifted, the hypothalamic centers will stimulate the pituitary gland to secrete two gonadostimulins FSH and LH and under the influence of gonadostimulins the ovaries will begin to secrete sex hormones. From 9 to 10 years of age, small amounts of estrogen are produced in girls progressive through the ovaries to a peak between the ages of 11 and 14, the age of puberty. The girl then sees major morphological changes at all levels: breasts, hair, voice, buttocks, thigh, etc.
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Under the action of estrogen and progesterone, breasts form well in their roundness and appearance, and develop rapidly. Development is main reference mark puberty: at first, the nipples become elevated, followed by the mammary gland itself It develops with nipple enlargement and areolar pigmentation. The breast does not develop in a year but gradually over a long period of time from puberty to the first pregnancy with the development of structures allowing lactation. During each menstrual cycle, the breasts continue to grow, and the breasts fluctuate with changes in plasma levels of estrogen and progesterone. But often, to 16 or 17 years old, pregnancy or not, the sex organs change from those of a child to those of an adult. The girl becomes a woman in every way. The external genitals enlarge. The effect of estrogen on the breasts becomes quite remarkable: fat deposition, roundness, glow, attraction, development of breast tissues and growth of an extensive malleable system. So that the breasts do not develop constantly, Mother nature has everything planned. At 16 or 17 puberty ends and estrogen levels drop dramatically to equilibrate with other hormones (progesterone, prolactin, testosterone). All hormones will be secreted in a certain proportion of which only God has the secret to determine the different states of the girl now become woman in every way.
Fat is the tissue that determines the size and shape of breasts. The size and shape of a woman’s breasts vary from community to community. The shape is often conical or spherical but may be discoid, piriform, or pedunculated. In some women, the amount of breast tissue is large, so their breasts are large. In others, the amount of breast tissue is less, as is the amount of fat. A woman's breasts are rarely the same size. Often a breast is slightly larger or smaller, higher or lower than the other, or not quite the same
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