The fetomaternal interface in the placenta of three species of armadillos (Eutheria, Xenarthra, Dasypodidae).

Reproductive Biology and Endocrinology : RB&E
Lorenna C RezendeMaria A Miglino

Abstract

Placental characters vary among Xenarthra, one of four supraordinal clades of Eutheria. Armadillos are known for villous, haemochorial placentas similar to humans. Only the nine-banded armadillo has been well studied so far. Placentas of three species of armadillos were investigated by means of histology, immunohistochemistry including proliferation marker, and transmission and scanning electron microscopy. The gross anatomy differed: Euphractus sexcinctus and Chaetophractus villosus had extended, zonary placentas, whereas Chaetophractus vellerosus had a disk. All taxa had complex villous areas within the maternal blood sinuses of the endometrium. Immunohistochemistry indicated the validity of former interpretations that the endothelium of the sinuses was largely intact. Tips of the villi and the columns entering the maternal tissue possessed trophoblast cell clusters with proliferation activity. Elsewhere, the feto-maternal barrier was syncytial haemochorial with fetal vessels near the surface. Differences among armadillos occurred in regard to the extension of the placenta, whereas the fine structure was similar. Parallels to the human suggest that armadillos are likely to be useful animal models for human placentation.

References

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Citations

Dec 4, 2012·Reproductive Biology and Endocrinology : RB&E·Andrea M MessMaria A Miglino
Oct 18, 2014·Evolution, Medicine, and Public Health·Alaric W D'Souza, Günter P Wagner
Jul 30, 2014·Animal Reproduction Science·Naira Caroline Godoy PieriDaniele Dos Santos Martins
Jan 29, 2013·Journal of Morphology·Anthony Michael Carter, Andrea Maria Mess
Apr 16, 2021·Placenta·Claudio Gustavo BarbeitoMirta Alicia Flamini
May 31, 2021·Brain Structure & Function·Borros Arneth

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Methods Mentioned

BETA
Scanning electron microscopy

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