• N Badwaik

      Articles written in Proceedings – Animal Sciences

    • Cytology and seasonal changes of the pituitary of the emballonurid bat,Taphozous melanopogon (Temminck)

      N Badwaik

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      The pituitary glands ofTaphozous melanopogon were examined histologically and cytochemically by employing several cytochemical staining techniques. The neural lobe is composed mostly of nerve fibres amidst which occur numerous small glial cells and a few Herring’s bodies. Two cell types have been identified in the pars intermedia. In addition to chromophobes, 5 different cell types, namely, 3 types of basophils (thyroid stimulating hormone, follicle stimulating hormone and luteinising hormone producing cells) and two types of acidophils (lactotrophic hormone and somatotrophic hormone producing cells), were identified in the pars distalis. The gonadotrophs and the lactotrophs aggregate in patches in certain regions of the pars distalis and exhibit cyclical changes in structure and number. The physiological significance of the cyclical changes of these cells is discussed in relation to the reproductive cycle of the animal.

    • Morphogenesis of the foetal membranes and placentation in the Indian molossid bat,Chaerephon plicata (Buchanan)

      A Gopalakrishna Y D Pendharkar N Badwaik

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      InChaerephon plicata the definitive amnion is formed by the development of folds. The yolk-sac splanchnopleure undergoes progressive collapse and folding until it ultimately remains as a free gland-like structure with hypertrophied endodermal and mesodermal cells. It acts as an active haemophagous organ after limb-bud stage. An extensive chorio-vitelline placenta, which is formed during early gestation is progressively abolished and replaced by the chorio-allantoic placenta. Two kinds of chorio-allantoic placenta are formed—a diffuse endotheliochorial placenta, which persists until about midpregnancy, and a definitive discoid placenta which is mesometrically located, labyrinthine and haemomonochorial.

    • Vascularisation of the placenta in some bats

      A Gopalakrishna N Badwaik

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      Vascularisation of the placenta of several species of bats representing 8 families is reported. Maternal vascularisation in all these bats is effected by a few large vessels which pass through the entire thickness of the placenta and give rise to numerous radial branches on reaching the foetal surface of the placenta. Maternal blood is returned through placental tubules which empty into large venous channels at the utero-placental junction. Foetal vascularisation is brought about by two allantoic arteries which capillarise over the placental tubules, and a large allantoic vein. In the exchange areas there is mostly crosscurrent circulation of the maternal and foetal bloods. Only in emballonurid bats is there an haematoma from which maternal blood is not drained back but is absorbed by cells of the trophoblast of chorionic villi.

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