Mammal Fetus
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“Diagram of foetal membranes. E., Embryo; H., gut lined by hypoblast, dotted-- the dark is mesoblast; UV., umbilical vesicle or yolk-sac; AC., amniotic cavity; am., amnion proper; sz., subzonal membrane; ALC., allantoic cavity; al., allantois; zp., may be here taken to represent the early epiblastic trophoblast. The figure does not show that the amnion folds consist of both epiblast and mesoblast.” -Thomson, 1916
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Comparative AnatomySource
J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)
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