weeks after conception the most obvious change is continuous throughout the pregnancy and breast swelling. In the early stages of pregnancy, the blood vessels of the breast increase and the surface veins become apparent, usually accompanied by pain and itching. In addition the nipple areola becomes large, the color becomes deep. Changes in breast tissue is ductal cells and acinar cell hyperplasia, resulting in ductal growth and branching, up to several times not pregnant.
A. phase 1: nipple protrusion.
from the beginning of mid pregnancy, acinar cell proliferation gradually reduced, replaced by changes in cell differentiation, acinar cells from mid pregnancy gradually turned into a single layer of secretory cells, so in mid pregnancy, can see a small amount of alveolus cavity has pale yellow liquid called colostrum. The breast swelling lasted for the entire period of pregnancy, this is due to the cell differentiation and development has been carried out, acinar cell secretion has been the reason for the increase.
E. fifth: after the age of fifteen, breast gradually mature and stereotypes.
the same as the breast and endometrium, will be affected by the female hormones, and change, for this variable organ, need more patience to understand and care.
girl to ten to twelve years of age due to hypothalamic secretion of gonadotropin releasing hormone, resulting in pituitary gonadotrophin secretion, further stimulate ovarian secretion of estrogen and progesterone. Estrogen stimulates the development of ductal and acinar, progesterone stimulates growth caused by the rapid growth of adolescent breast tissue. The development of puberty in general is divided into five stages:
C. third: about thirteen to fourteen years old, nipple and breast continue to develop.
D. fourth period: from fourteen years old to fifteen years old, areola and nipple and breast began to uplift, also gradually into a ball.
(Editor: Teng Betty internship editor: He Lili
1 early childhood:
was born, nipple, areola forming system and contains 15~20 duct acinus leaves, the acini contain a small amount of Colostrum (due to maternal estrogen stimulation, resulting in fetal breast secretion.) However, within one week after birth, it will be discharged from the nipple to three to four weeks postpartum, and acinar tissue will quickly degenerate into a catheter. In infancy and childhood, there is no breast development.
B. second period: from ten to twelve around the age of onset of breast development, breast areola becomes larger, the formation of a hill.