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Detailed observations were made of the structure and microvasculature of the palatine mucous membrane of the common squirrel monkey (Saimiri sciureus) by means of the plastic injection method under a scanning electron microscope. The findings obtained were compared with those of the Japanese monkey and other mammals. The osseous palate was flat horizontally and a pair of incisive foramina were apparently open at the anterior end of the hard palate. At the posterior end of the osseous palate, the pterygopalatine incisurae were found bilaterally. The incisive papilla was not obvious in form and size, and a pair of openings of the incisive canal were always situated on both sides of the papilla. The transverse palatine plicae or ridges numbered 7 or 8 symmetrically. They arched posterolaterally with an anterior protrusion near each median end. Posterior plicae were underdeveloped. Numerous openings of the palatine glands were found in the soft palatine mucosa. The arteries supplying the palate were the major palatine artery passing through the major palatine foramen and the soft palatine artery passing through the pterygopalatine incisura. The major palatine artery extended forwards giving off numerous medial and lateral branches, and its end on the respective side entered a small foramen located lateral to the incisive foramen. Medial and lateral branches formed the submucous arterial network. Arterioles diverging from this network were directed to the epithelial surface and formed an arterial network in the lamina propria. Further, capillaries diverging from the latter network built up the subepithelial capillary network immediately beneath the epithelium. Capillary loops sprouting from the capillary network were found in the form of a simple hair-pin without locational differences in their heights. The microvascular architecture thus displayed some similarity with that of the Japanese monkey. However, the vascular networks in the lamina propria and submucous layer were not distinct in size and scale as compared to those of the Japanese monkey. These differences may be related to the stature, living environment and food habits of this species.

Microvascular Architecture of the Palatine Mucosa in the Common Squirrel Monkey (Saimiri sciureus)