PMID: 2751120Jan 1, 1989

Fetal membranes and placenta of the African green monkey (Cercopithecus aethiops)

Anatomy and Embryology
G E OwitiA G Hendrickx

Abstract

This study examined developmental changes in fetal membranes and placenta of Cercopithecus aethiops from a Carnegie developmental stage 12 embryo to near-term fetuses. Ultrastructurally, yolk sac cells (endoderm and mesothelium) were similar to comparable stages in other primates. Endodermal cells had few apical microvilli, abundant rough-endoplasmic reticulum, electron dense mitochondria and dense bodies. In contrast, mesothelial cells were squamous with numerous microvilli, small mitochondria and a few short strands of rough endoplasmic reticulum. Amnion cells early in gestation were squamous with few microvilli, large glycogen deposits and poorly developed cytoplasmic components. Tight junctions and desmosomes held adjacent cells together. The basal surface was smooth and the basal lamina was distinct. As development proceeded the amniotic cells became cuboidal and possessed numerous microvilli. Cytoplasmic organelles were better developed and glycogen deposits increased by mid-gestation. A thick layer of microfibrils and collagen fibers was prominent below the basal lamina. Near-term, the glycogen had virtually disappeared and the amount of lipid droplets increased. Basal infoldings and podocytic processes and the extracell...Continue Reading

References

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Citations

Mar 1, 1996·Pediatric Surgery International·Z Zachariou, R Daum
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Related Concepts

Structure of Amnion
Cercopithecus
Cercopithecus tantalus
Chorion
Decidua
Extraembryonic Membranes
Electron Microscopy
Placenta
Yolk Sac

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