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CHAPTER 50 – Colon and Rectum

Robert D. Fry, MD,
Najjia Mahmoud, MD,
David J. Maron, MD,
Howard M. Ross, MD,
John Rombeau, MD

  Embryology of the Colon and Rectum
  Anatomy of the Colon, Rectum, and Pelvic Floor
  Physiology of the Colon
  Bowel Preparation Before Surgery
  Diverticular Disease
  Colonic Volvulus
  Large Bowel Obstruction and Pseudo-obstruction
  Inflammatory Bowel Disease
  Infectious Colitis
  Colonic Ischemia
  Neoplasia
  Pelvic Floor Disorders and Constipation
  Laparoscopic Colon Resection
EMBRYOLOGY OF THE COLON AND RECTUM

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 …