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The morphology of the ileocecocolic transition, between the small and large intestine was studied in 33 male, adult pigs of unknown breed. The results were analyzed by the Wilcoxon Test (alpha < or = 0.05). The ileum opened into the large intestine, in all of the cases, at the level of the cecocolic junction in the form of a conical papilla (ileal papilla) turned towards the large intestine, with an oblique caudal and lateral direction, pointing to the cecal lumen. The cranial contour is higher than the caudal one, with average values of 3.0 cm, and 1.5 cm in the fresh specimens and 2.8 cm and 1.4 cm after fixation of the specimens. The average diameter of the papilla apex was 1.5 cm, both in the fresh specimens and in the fixed ones. In 100% of the cases the ileal papilla appeared with a star-shaped orifice in its apex in both the fresh and in the fixed specimens. Our studies showed that the transition between the small and large intestine of the swine is ileocecocolic, thus similar to humans and different from the ileocecal (Perissodactyla, Rodentia, Lagomorpha) and, according to most descriptions, ileocolic (dog) transitions found in other animals.