Venous drainage patterns of the stomach in some orders,families and species of laboratory mammals.

Venous drainage of the stomach and its patterns were studied in 30 laboratory mice, 31 laboratory rats, 30 golden hamsters and 30 guinea pigs (rodentia:mouse family, hamster family and guinea pig family), in 30 domestic rabbits (lagomorpha) and in 30 domestic cats (carnivora,felidae family). The main criterion was presence or absence of the v.gastroepiploica dextra. In mice it was present in 50% of cases, in rats in 35% of cases, in golden hamsters in 86% of cases, in guinea pigs in 89% of cases, in rabbits in 90% of cases and in cats only in 14% of cases. Other venous chanels from the stomach were tributaries of the v.lienalis and interorgan venous anastomoses. In mice,rats, golden hamsters and cats a complete or almost complete venous arc around the curvatura major ventriculi (anastomoses between the v.gastroepiploica dextra and sinistra) was missing. In guinea pigs it occurred in 70% of cases, in rabbits in 35% of cases. The findings demonstrate greater differences of the stomach venous patterns in cats in comparison with other animals examined (Rodentia,Lagomorpha). In each animal order,family or species it was possible to find typical stomach venous patterns.