青春期,乳房开始挺立女孩乳腺的发育在8～10岁就开始。乳腺发育表明卵巢已开始分泌雌激素,在其他激素如泌乳素、生长素等的共同参与下,脂肪组织以及乳腺内的纤维结缔组织数量增多,质地变软,乳腺内血管增生以适应增生乳腺等的血供。这时,乳房渐渐挺拔起来。 Adolescence, breasts began to stand up Girl’s development in the 8 to 10 years old began. Breast development shows that ovaries have begun to secrete estrogen. Under the joint participation of other hormones such as prolactin and auxin, the quantity of fibrous connective tissue in adipose tissue and mammary glands increases, the texture becomes soft, and the mammary gland hyperplasia to adapt to hyperplastic mammary gland Blood supply. At this time, the breast gradually upright.