Small Intestines of the Cat

Duodenum:

It begins at the pylorus to the right of the median plane. The duodenum passes cranially and dorsally for a short distance as the cranial part, then it turns caudally to form the cranial duodenal flexure. The cranial part attached to the liver by the hepatoduodenal ligament. From the cranial duodenal flexure the duodenum continues caudally on the right as the descending duodenum, which encloses the right lobe of the pancreas on its broad mesoduodenum. At the level of fifth or sixth lumbar vertebra it passes from right to left around the cecum and the root of the mesentery to form the caudal duodenal flexure. Continuing cranially from the caudal duodenal flexure is the ascending duodenum, which joins the jejunum at the duodenojejunal flexure.

Jejunum:

Is the longest part that form the coils of the small intestine. It is suspended to the roof of the abdominal cavity by the long mesentery. The jejunum constitutes the large intestinal mass between the stomach and the pelvic inlet that is covered ventrally and laterally by the greater omentum. It terminates at the ileum on the right side of the median plane.

Ileum:

Is the short terminal part of the small intestine. It passes cranially to open into the proximal end of the ascending colon at ileocolic orifice. The extent of the ileocolic fold and the length of the ileal arteries are usually used to approximate the length of the ileum