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Histology and ultrastructure of the placental membranes of the viviparous brown snake, Storeria dekayi (Colubridae: Natricinae) by Daniel G. Blackburn; Kristie E. Anderson; Amy R. Johnson; Siobhan R. Knight; Gregory S. Gavelis is a Environmental Science article available to read on EtoBox.

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## Abstract The placental membranes of the viviparous brown snake __Storeria dekayi__ were examined following mid‐gestation by means of light microscopy, scanning electron microscopy, and transmission electron microscopy to reveal their structural organization and cytological composition. By Zehr stage 32, the chorioallantoic placenta (allantoplacenta) is established around much of the egg, and a well‐developed omphalallantoic placenta occurs in the abembryonic hemisphere. The allantoplacenta exhibits multiple features that enhance interhemal exchange: the uterus and allantois are well vascularized, the chorionic and uterine epithelia are attenuated, and the shell membrane is vestigial and has begun to degenerate. In the omphalallantoic placenta, the uterine epithelium is enlarged and appears to be secretory. The omphalopleure contains two distinct populations of cells, and shows cytological evidence for absorption. In intermediate areas, regions of omphalallantoic placenta are being transformed into allantoplacenta, through depletion of the isolated yolk mass and reduction in epithelial height of both uterus and omphalopleure. Morphological evidence suggests that the allantoplacen

Who reads Histology and ultrastructure of the placental membranes of the viviparous brown snake, Storeria dekayi (Colubridae: Natricinae)?

Author

Daniel G. Blackburn; Kristie E. Anderson; Amy R. Johnson; Siobhan R. Knight; Gregory S. Gavelis

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)