Vascular arrangement in the oral mucosa of Rana esculenta. Scanning electron microscopy of corrosion casts.

Corrosion casts of the blood vessels in the oral mucosa of Rana esculenta were examined by the scanning electron microscope. Special attention was paid to the palatine capillaries characterized by numerous blind diverticula. Microanatomy and topography of these peculiar vessels suggests their involvement in gas exchange. The diverticula of the capillaries visible in the casts in form of nodules of various shape and size were examined in detail.