第三节胎膜、胎盘和胎儿营养学 胎膜( Fetal Membranes) 二、胎盘( Placenta) 三、胚胎和胎儿的营养特点
第三节 胎膜、胎盘和胎儿营养学 一、胎膜（Fetal Membranes) 二、胎盘 (Placenta) 三、胚胎和胎儿的营养特点
1 d 6 5 10 3 11 11 169 Conceptus ' in utero' at the end of the third month dorsal aspect
胎膜和胎水 1.胎膜和胎囊 卵黄膜( Yolk membrane)、羊膜( Amnion) 尿膜( Allantoic memberane)和绒毛膜( Chorion) 卵黄囊( Yolk sac)、羊膜囊( Amniotic Cavity) 和尿囊( Allantois) (3)发育完成的 (4)脐带( Umbilical cord 2.胎水 3.多胎时胎膜间的关系
一、胎膜和胎水 1.胎膜和胎囊 (1)胎膜：卵黄膜（Yolk Membrane） 、羊膜（Amnion ）、 尿膜（Allantoic Memberane）和绒毛膜（Chorion） (2)胎囊：卵黄囊（ Yolk Sac） 、羊膜囊（Amniotic Cavity） 和尿囊（Allantois） （3）发育完成的胎膜： （4）脐带(Umbilical Cord) ： 2.胎水 3.多胎时胎膜间的关系
amn obc cavty embryo allantois bryon c ask trophoblast chorionic viih (charan) IsotErm a.14 days c, 28 days bilal cord (:G e. 42 days igure 51.11 Human embryonic dcvclopment. At first there are only tisswes present in the embryo. The amniotic the embryo, and the yolk sat is below. b. The chorion is developing viti, so important to exchange between mother and chi one membrene d. These extraembryonic membranes are positioned inside the body id. e. the as i become mbilical cord. .. At 42 days, the embryo has a head region and a tail region. The umbilical cord takes blood wessels between the embry he chorion ( placental
Amnionic cavity Allantois Yolk Ectoderm Endoderm Trophoderm Mesoderm Amnionic cavity IiMMMIIIIL,S Amnion Allantois TYOIK sac Allantois cavity Allanto-chorion Figure 8-3 Progressive development of the extraembryonic mem- branes including fusion of the chorioamnionic folds and the allantois with the chorion (Redrawn from Patten. 1964. Foundations of Embryology McGraw-Hill.)