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The alimentary canals of five males weighing 31.5-42.8 g and five females 31.2-43.3 g - of Apodemus flavicollis (Melchior, 1834) were studied. Lengths of the alimentary canals segments were measured together with thicknesses of tissues forming their wall and the internal and external areas of the segments were then calculated In stomach there is a proventriculus structured like an esophagus. The surface layer of epithelial cells becomes cornified (52% of epithelial lamina thickness), which supports mechanical treatment of food. In the fundus of the stomach, there is a strongly-developed glandular layer (38% of wall thickness). The internal area of small intestine dominates the digestive-absorptive area of alimentary canal (70%). The large intestine is second largest segment in internal area - 22%. The sizes of the alimentary canal, ie length and external and internal areas, are 11-16% larger in females, which shows the female adjustment to reproduction. The relative value of digestive absorptive area (mm(2)/g) reaches 206.8 mm(2)/g (females) and 164.0 mm(2)/g (males). The size of the alimentary canal of A. flavicollis reflects an accomodation of the canal to the digestion and absorption of the animal diet rich in calories, especially of insects which constitute the main component of the diet.

Histometry and surface area of the alimentary canal of Apodemus flavicollis