SCANNING ELECTRON MICROSCOPIC EXAMINATION OF MUCOSAL EPITHELIUM OF THE ALIMENTARY CANAL OF NANDUS NANDUS (HAMILTON)
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Authors
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SOMA GOSWAMI
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APURBA RATAN GHOSH
Abstract
The mucosal epithelium of the buccopharynx, oesophagus, stomach, intestine and rectum of Nandus nandus (Hamilton) have been systematically studied with the help of scanning electron microscope (SEM). The buccopharyngeal mucosa is devoid of any prominent mucosal folds and consisted of closely connected pentagonal and / or hexagonal stratified epithelial cells arranged with microridges arranged in concentric whorls sometimes interfaced with prominent taste buds. The mucosal surface of the oesophagus was consisted of prominent longitudinal mucosal folds typified into a series of round or oval epithelial cells with regularly spaced microridges forming deep channels in between to hold mucins. The inner surface of the stomach is lined with columnar epithelial cells with short and stubby microvilli. Prominent gastric pits were surrounded by epithelial cells. Irregular and zig-zag type of infoldings are the characteristic features of the intestine and each infolding is supported by columnar epithelial cells with densely packed microvilli at the cell apices. The rectal folds anastomosed with each other forming shallow irregular depressions. The inner mucosal surface of the rectum is closely packed with columnar cells with short microvilli.
Keywords : Alimentary canal; Nandus nandus; SEM
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