Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 9(12): 2234-2246
Http://dx.doi.org/10.17582/journal.aavs/2021/9.12.2234.2246
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Zeinab Abdelftah, Ahmed Ragab, Rasha E. Abo-Eleneen, Ahlam M. EL-Bakry*

Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.

Abstract | Due to the epithelial ion barrier, the stromal latticelike structure of collagen fibrils, and the endothelial cells, the corneas of most vertebrate’s species stay transparent. The corneal epithelium, the corneal endothelium, or both, play an important role in controlling corneal hydration, depending on the species. Three mammalian families [Pteropodidae (Rousttus egyptiacus), Leporidae (Oryctolagus caniculus; Muridae (Rattus norvigerious)] of the present study were collected from different locations of Egypt. The investigated cornea was dissected free from the orbit and prepared for light and scanning electron microscopy and special stain. Three investigated mammalian species composed of three identical layers; epithelium, stroma, and endothelium besides appearance of Bowmen’s membrane in Rousttus egyptiacus and Oryctolagus caniculus. On the other hand, descemet’s membrane appear only in Oryctolagus caniculus. The investigated epithelial layers showed moderate affinity to stain with by Periodic Acid Schiff stain in Roussttus egyptiacus and Oryctolagus caniculus, although high activity with PAS stain in Rattus nirvigurios. Their corneal epithelium cells distinguished by irregular polygonal cells covered with moderated density of shorted microplicae. The ultimate goal is to keep the cornea transparent and provide the greatest refract. According to the rabbit cornea and its adaptive trends have eloquently described the vertebrate eye’s relative optical features. The study presents a brief image/account of certain structures of cornea for three of mammalian’s species and to correlate them with the different circumstances and variation of habitats.

Keywords | Cornea, Mammals, SEM, Stroma, Microprojections