Development of Stomach and Greater Omentum The foregut begins as a simple, midline, tubular structure lined by epithelium derived from endoderm. While the endoderm creates the lining of the stomach, the visceral mesoderm that surrounds it will form the muscles,…
Development of Esophagus The esophagus is the first section of the foregut and begins at the distal end of the pharynx. As with the rest of the digestive tract, the cells that line the lumen of the esophagus are derived…
Development of Mouth and Pharynx The lining of the primitive gut tube is derived from the embryonic endoderm and the supporting tissues and mesentery from the visceral layer of lateral plate mesoderm. The amniotic cavity expands around the developing embryo…
Development of Gastrointestinal Tract We will take a very short tour of early development prior to the trilaminar embryo stage, at which time we will follow the development of the gastrointestinal tract in detail. Thereafter, for each region of the…
Development of Large Intestine The development of the large intestine is intimately tied to the development of other organs. The cecum, appendix, ascending colon, and transverse colon are part of the midgut and develop alongside the jejunum and ileum. The…
Development of Small Intestine The small intestine includes the duodenum, jejunum, and ileum. During development of the gastrointestinal system, the duodenum comes from the distal portion of the foregut, whereas the jejunum and ileum come entirely from the midgut. The…
Blood Supply of Small and Large Intestines The blood supply to the small and large intestines is extremely variable and unpredictable. The variations concerning the origin, course, anastomoses, and distribution of the intestinal vessels are so frequent and so significant…
Development of Pancreas The foregut is the first segment of the gut tube within the abdomen. It is attached to the anterior body wall by a ventral/anterior mesentery and posteriorly by a dorsal/posterior mesentery, the latter distributing blood from the…
Development of Gallbladder and Bile Ducts The foregut is the first segment of the gut tube within the abdomen. It is attached to the anterior body wall by a ventral/anterior mesentery and posteriorly by a dorsal/posterior mesentery, the latter supplying…
Development of Liver The foregut is the first segment of the gut tube within the abdomen. It is attached to the anterior body wall by a ventral/anterior mesentery and to the posterior wall by a dorsal/posterior mesentery, the latter supplying…