Figure 5
From: Comparative aspects of trophoblast development and placentation
Placentation in primates (Euarchonta). (A) Epitheliochorial placenta of a bush baby, Galago crassicaudata. The interhemal membrane comprises maternal capillary (MC) endothelium, uterine epithelium (UT EP), cellular trophoblast (CYTO TR) and fetal capillary (FC) endothelium. (B) Endotheliochorial placenta of a tree shrew, Tupaia glis. The interhemal region contains maternal endothelium (MAT ENDO), syncytiotrophoblast (SYN TR) and the endothelium of the fetal capillary (FC). Reprinted from reference [52] with permission ©Springer-Verlag 1985. (C) The villous, hemomonochorial human placenta. The maternal blood space (MBS), or intervillous space, is lined by a thin layer of syncytiotrophoblast (SYN TR).