Membrane,Fetal
《英文msh词典》Membrane,Fetal
[入口词] Membrane,Fetal
[主题词] Fetal Membranes
[英文释义] Thin layers of tissue which surround the embryo or fetus and provide for its nutrition,respiration,excretion and protection; they are the yolk sac,allantois,amnion,and chorion.