PMID: 22763958Jul 6, 2012

Adaptation of Camelus dromedarius pars nervosa of the hypophysis to winter and summer living conditions

Folia Histochemica Et Cytobiologica
F Z Djazouli AlimNicole Mahy

Abstract

The aim of this work is to study the characteristics of the dromedary nervous lobe and determine how the seasons condition its organization. To this end, electron microscopy was performed and examined quantitatively on animals from winter and summer periods. The results show a higher number of cells in the nervous lobe in summer than in winter. The most abundant glial elements in winter are light pituicytes engulfing neurosecretory nerve fibers making neuroglial contact, and dark pituicytes containing numerous heterogeneous light bodies. In summer, the most distinctive glial cells may be pituicytes in a phagocytic state making contact with characteristic large light bodies that could represent a degenerative process of large neuropeptide storage. Granular pituicytes were also observed in contact with glial and neuronal components. However, lipid droplets, described in pituicytes of other mammals, were not observed in our samples. Quantitative analysis of neurovascular contacts revealed that the number of nerve terminals contacting the basal lamina did not differ between summer and winter, but the mean number of glial processes increased in winter. Our data provides evidence that the storage of neuropeptides is very marked in su...Continue Reading

Citations

Jun 19, 2019·PloS One·Fatma Zohra Djazouli AlimCharles C T Hindmarch

Related Concepts

Adaptation, Physiological
Metazoa
Camelus dromedarius
Neuroglia
Phagocytosis
Infundibular Stem
Seasonal Variation
Camelus dromedarius
Environment
Electron Microscopy

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