正常的乳汁分泌是指自产褥期开始,维持一定时期以供给新生儿必要的营养。适量的乳汁分泌以外皆属异常。它可分为哺乳期乳汁分泌量的异常和非哺乳期之异常乳汁分泌。乳汁分泌的机理乳房的发育、乳汁分泌的开始、排乳和乳汁分泌的维持均受神经、内分泌所调节。乳房的发育主要是受自青春期开始分泌较高的雌激素和黄体酮的作用。妊娠后血中的雌激素和黄体酮的量更持续增高。此时乳腺发育显著,血管分布丰富,乳房明显增大。于 Normal milk secretion refers to the beginning of the puerperium, to maintain a certain period of time to provide Neonatal nutrition necessary. The right amount of milk secretion are abnormal outside. It can be divided into abnormal lactation milk secretion and non-lactating abnormal milk secretion. The mechanism of milk secretion Breast development, the beginning of milk secretion, breast milk and milk secretion are maintained by nerve, endocrine regulation. Breast development is mainly due to the secretion of higher estrogen and progesterone from puberty. After pregnancy, the amount of estrogen and progesterone in the blood continues to increase. Breast at this time significant development, rich vascular distribution, breast increased significantly. in