In tetrapods, the ileocaecal valve is always present, opening into the colon.
2.
These studies showed that the mesocolon is continuous from the ileocaecal to the rectosigmoid level.
3.
It was also shown that a mesenteric con�uence occurs at the ileocaecal and rectosigmoid junctions, as well as at the hepatic and splenic �exures and that each confluence involves peritoneal and omental attachments.