title: [Divergent development of yolk sac epithelium and its functional characteristics in rats during gestation].
abstract: Yolk sac epitheliocyte differentiation in rat during physiological pregnancy was examined with transmission electron microscopy and morphometry methods. Divergent development of embryonic structures in visceral and parietal layers was noted on day 11. By day 17 of embryonic development visceral layer epitheliocytes were characterized by morphologic features of intensely resorbing cells, while parietal layer cells revealed some signs of active peptide synthesis. Yolk sac epithelium interaction with trophoblastic elements results in the formation of the sinus of Duval, elements of which are involved in selective transport of substances. Polymorphism of yolk sac epithelium is responsible for different trophic functions in rat fetus during gestation.
authors.forename: N N
authors.initials: NN
authors.lastname: Dubinina
authors.forename: Iu I
authors.initials: IuI
authors.lastname: Sklianov
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D004848:Epithelium / Q000502:physiology / Q000648:ultrastructure; D005260:Female; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D014817:Vitelline Membrane / Q000502:physiology / Q000648:ultrastructure; D015017:Yolk Sac / Q000502:physiology* / Q000648:ultrastructure