Abstract
Histology of the hindstomach mucosa of two collared peccaries, Dicotyles tajacu, was observed. The tissue samples were collected from 21 loci of the hindstomachs previously fixed and preserved in a buffered formalin. The pyloric mucosa is limited to a small area close to pylorus. Non-glandular mucosa is present in the region oral to the low folds which are continuous to the lips of the gastric groove. Cardiac gland exists microscopically between fundic and non-glandular eoithelia and in the region close to the dorsal transverse fold. The fundic mucosa occupies most of the hindstomach mucosa and is twice as thick as the pyloric mucosa. Its thickness is 2.00mm on an average. The fundic gland is well-developed simple tubular type and the number of the gland cells per one-side of the tubule is as many as 503 on an average. In the very straight neck portion, a pair of the mucous neck cells or chief cells are closely associated with one parietal cell. Owing to the invagination in the isthmus, the parietal cells take the distinct distal position to the lumen. The general histology of the peccary fundic gland appears to be fundamentally similar to that of the pig, though the gland is more developed in the pig. Three kinds of endocrine cells (setotonin-storing EC cells, somatostatin-storing D cells and gastrin-storing G cells) are identified in the peccary hindstomach by the immunocytochemical method.
