应用透射电镜对１２例足月妊娠胎盘组织合胞体细胞合成区和运输区的微绒毛和线粒体进行体视学测试，结果发现合成区微绒毛表面积密度，体积密度和表面积均大于运输区，线粒体体积密度，数密度和表面积密度也大于运输区。表明胎盘合胞体细胞合成区功能比运输区活跃，能量代谢增加，是执行胎盘各种功能活动的主要场所 Transmission electron microscope (TEM) was used to examine the microvilli and mitochondria of placental syncytial syncytial cells in placenta from 12 full-term gestational placenta tissues. The results showed that the microvilli surface area density, bulk density and surface area in the synthetic area were larger than those in the transport area, mitochondrial volume Density, number density and surface area density are also greater than the transport area. That placental syncytial syncytial cell function than transport area active, increased energy metabolism, the implementation of various functional activities of the placenta is the main place