401002 Lecture Notes - Lecture 15: Intrinsic Factor, Atpase, Lipase
16 Feb 2020
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Document Summary
The outermost layer of the gastrointestinal tract consists of several layers of connective tissue. Intraparietal parts of the gi tract are covered with serosa. These include most of the stomach, first part of the duodenum, all of the small intestine, caecum and appendix, transverse colon, sigmoid colon and rectum. In these sections of the gut there is clear boundary between the gut and the surrounding tissue. These parts of the tract have a messentery. They blend into the surrounding tissue and are fixed in position. For example, the retroperitoneal section of the duodenum usually passes through the transpyloric plane. These include the oesophagus, pylorus of the stomach, distal duodenum, ascending colon, descending colon and anal canal. Approximately 20,000 protein coding genes are expressed in human cells and 75% of these genes are expressed in at least one of the different parts of the digestive organ system.
