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Development of the foetal membranes and placentation in the Indian false vampire bat,Megaderma lyra lyra (Geoffroy)

  • Published:
Proceedings of the Indian Academy of Sciences - Section B, Animal Sciences

Abstract

The amnion expands to accommodate the growing foetus without undergoing any noticeable histological change. The yolk sac is large and forms an extensive chorio-vitelline placenta on the lateral sides of the uterus during early stages of gestation. However, due to the extension of the exocoelom and the expansion of the amniotic cavity the vascular splanchnopleure of the yolk sac is separated from the placenta and is invaginated towards the abembryonic trilaminar omphalopleure. The endodermal cells of the yolk sac hypertrophy as the yolk-sac wall gets vascularized, and the mesodermal cells enlarge only during the final stages of pregnancy. The allantoic vesicle, which is large during early stages of gestation, becomes progressively reduced and is finally lost during the final stages of pregnancy. The placenta, which is extensive during early stages, becomes restricted to a discoidal structure on the mesometrial side of the uterus. The definitive placenta is labyrinthine and vasomonochorial. Numerous free chorionic villi, which come into direct contact with the decidua at the margin of the placental disc, constitutes an accessory syndesmochorial placenta.

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Abbreviations

all. pl:

allantoic placenta

all. v.:

allantoic vesicle

am:

amnion

am.c:

amniotic cavity

bi. om:

bilaminar omphalopleure

ch. pl:

chorionic placenta

ch-v. pl:

chorio-vitelline placenta

exo:

exocoelom

mes:

mesometrium

trio. om:

trilaminar omphalopleure

u. gl:

uterine gland

y-s. c:

yolk-sac cavity

y-s. spl:

yolk-sac splanchnopleure

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Author notes

  1. M S Khaparde

    Present address: NCERT, New Delhi

Authors and Affiliations

  1. Department of Zoology, Institute of Science, 440 001, Nagpur

    A Gopalakrishna & M S Khaparde

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  1. A Gopalakrishna
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  2. M S Khaparde
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Gopalakrishna, A., Khaparde, M.S. Development of the foetal membranes and placentation in the Indian false vampire bat,Megaderma lyra lyra (Geoffroy). Proc. Indian Acad. Sci. (Animal Sciences) 87, 179–194 (1978). https://doi.org/10.1007/BF03179005

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  • DOI: https://doi.org/10.1007/BF03179005

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