Najjia Mahmoud, MD,
David J. Maron, MD,
Howard M. Ross, MD,
John Rombeau, MD
No comprehensive discussion of colorectal anatomy is complete without a thorough understanding of the genesis of the gastrointestinal tract. Knowledge of the developmental anatomy of the foregut, midgut, and hindgut establishes a context in which to consider mature structural and functional anatomic relationships.
The endodermal roof of the yolk sac gives rise to the primitive gut tube. At the beginning of the third week of development, the gut tube is divided into three regions: the midgut, which opens …