The breast formation experience
The breast is the common feature of the mammal, generally become to the growth, zygomorphy, bilateral symmetry.Mankind’s mammary gland only has before the chest, thorax of 1 rightness, come from an ectoderm.After be born, breast development experience infancy, puberty, sexual maturity period, trimester of pregnancy, lactation period and menopause’s etc. not corresponding period.In the each one not contemporaneous variety, the machine body level difference of the endocrine hormone is very big, is affect by it and breast development and physiology action are also each to have special features.
The kid is mid-term, expect in the neonate, newborn, can get into little infant’s in vivo through a placenta because of the maternal female sex hormone, cause a mammary gland tissue hyperplasia, past have 60% or so neonate, newborn around 2~4 days appear the papillae next 1~2 cm the induration of the size after be born, also a little amount human milk kind material secretion, along with the gradual metabolism of maternal hormone, this kind of phenomenon can 1~3 turnovers disappear by oneself after be born.Here what to need to be point out BE, absolutely not to and by hand squeeze a papillae, the in order to prevent results in an infection.Our country some regions spread thus of customs, namely the neonate, newborn birth all squeezes a papillae behind, otherwise thinking will make papillae hollow, this kind of understanding isn’t scientific, the way of doing also can’t take, result in the reason of papillae depression be the embryo period mammary gland dysplasia, but not because of DOing not squeeze a papillae.At baby’s infancy, the mammary gland is basically placed in a “static” condition, the gland body presents to back to go sex mutation, the male compare of the female be more complete.From the puberty start, under the influence of various endocrine hormone, the female breast got into the physiology in the whole life development and action activity the most active period, until menopause.
After experiencing puberty, the tissue structure of the mammary gland has already tend perfect, got into a sexual maturity a period a mammary gland.In each menstrual cycle, along with the periodic variety of ovary endocrine hormone, the mammary gland tissue also takes place to go round and begin again of hyperplasia with return to old of variety.Trimester of pregnancy and lactation’s expect is a reproductive life women of special physiology period, at this time in order to adapt this kind of special physiology need, the mammary gland also a series happenned variety.From the menopause beginning, the ovary endocrine hormone reduces gradually and the breast physiology activity gradually dies down.
Sep
09
By: Gelais
