Observations on the stomach of the Indian fruit bat, Rousettus leschenaulti (Desmarest)

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Abstract
The stomach of R. leschenaulti conforms to that of the typical frugivorous bats where the esophagus leads into the cardiac vestibule and the rest of the stomach is an elongated tube with a conspicuous and large fundic caecum. There is a flap-like fold of the circular layer of muscles at the caudal end of the cardiac vestibule on its left. The circular layer of muscles forms a sphincter valve at the gastro-duodenal junction. The aperture of the pyloric sphincter is eccentric and lies towards the lesser curvature. The rugae occur in the form of protruberances of various shapes in the fundic caecum and in the form of parallelly arranged longitudinal folds in the rest of the regions of the stomach. The gastric mucosa contains the usual types of cells. The parietal cells are the predominant type of cells. The Brunner''s glands occur in the submucosa of the pylorus, on both the surfaces of the pyloric sphincter and along the duodenum. The gastric glands contain mostly neutral mucins with some sialomucins. The Brunner''s glands that lie along the duodenum elaborate only neutral mucins whereas those on the sphincter and in the pylorus elaborate both neutral and acidic mucins.

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