Gut development video   -Interactive video text

The hindgut begins from posterior 1/3rd of the transverse colon through the descending colon, the sigmoid colon and the rectum and the upper 2/3 of the anal canal. This portion is called the endodermal part of the anus. The remaining 1/3 of the anal canal develops from the ectoderm. It is called the ectodermal part and is surrounded by the somatopleuric mesoderm. The upper part is surrounded by the splanchnopleuric mesoderm which is the mesoderm of the whole of the gut tube.

During development the descending colon looses its mesentery and becomes retroperitoneal. So also the rectum which is plastered to the hollow of the sacrum.

The anus develops from both endoderm and ectoderm. Originally the cloaca is placed in front of the urorectal septum. The posterior aspect forms the hindgut and anus while the front forms certain urogenital organs. Somatopleuric mesoderm also takes part in the formation of the anus.

The mesoderm forms the muscular coat of the gut while the endoderm forms the inner coat of the gut which also forms the glands and the ducts. The most external coat of the gut tube formed from the thin mesodermal lining of the celomic cavity.

The blood supply of the gut comes from the development of the mesoderm of the mesentery. The foregut is supplied by the celiac trunk, the mid gut by the superior mesenteric artery  and the hindgut by the inferior mesenteric artery. The ectodermal part of the anal canal has a different blood supply.












Oluwole Ogunranti 

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