胎盘是母体与胎儿间的特殊器官,同时具有多种功能,如胎儿呼吸,营养运输及排泄,胎盘又是蛋白质及激素合成的器官,并具有免疫及防御作用等等。这些作用随妊娠时间递增。绒毛的发育,胎盘的形成与维持早孕关系密切,在抗早孕的研究中对绒毛及胎盘的探讨有重要意义。本文仅就正常胎盘的形态结构及部分组织化学反应综述如下: 一、绒毛和胎盘的形成受精卵在输卵管中运行3～4天,不断进行卵 Placenta is a special organ between maternal and fetus, at the same time has a variety of functions, such as fetal respiration, nutrient transport and excretion, placenta is a protein and hormone synthesis organs, and has immune and defensive effects and so on. These effects increase with gestational time. The development of villus, the formation of placenta and the maintenance of early pregnancy are closely related to the study of anti-early pregnancy on the villi and placenta is of great significance. This article only on the normal placental morphology and structure of some histochemical reactions are summarized as follows: First, the formation of villi and placenta Fertilized eggs running in the fallopian tube for 3 to 4 days, keep the eggs