Stephen J. Schueler, M.D.

Overview Underlying Cause Anatomy

Blood in the Stool Anatomy

To better understand rectal bleeding, it helps to understand the anatomy of the colon, rectum and anus.

The large intestine is also known as the colon. It is the last portion of the intestine.

The colon has several parts, including:

  • Cecum:
    • The portion of the colon that connects to the ileum (small intestine). The appendix is a finger-like pouch that comes off of the cecum.
  • Ascending colon:
    • The first section after the small intestine, located on the right side
  • Transverse colon:
    • Sits horizontally across the upper abdomen
  • Descending colon:
    • Located on the left side of the abdomen
  • Sigmoid:
    • A short, S-shaped section above the rectum
  • Rectum:
    • The lowest internal part of the colon

Intestinal anatomy:
  • Entire gastrointestinal tract
  • Intestines and other abdominal organs
  • Blood vessels of the intestines
  • The appendix is a small pouch that protrudes from the wall of the large intestine. It is located at the point where the small intestine turns into the large intestine.

Last Updated: Jan 3, 2011 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Blood in the Stool References
  1. Farrell JJ, Friedman LS. Review article: the management of lower gastrointestinal bleeding. Aliment Pharmacol Ther. 2005 Jun 1;21(11):1281-98. [15932359]
  2. Hoedema RE, Luchtefeld MA. The management of lower gastrointestinal hemorrhage. Dis Colon Rectum. 2005 Nov;48(11):2010-24. [16175326]
  3. Olds GD, Cooper GS, Chak A, Sivak MV Jr, Chitale AA, Wong RC. The yield of bleeding scans in acute lower gastrointestinal hemorrhage. J Clin Gastroenterol. 2005 Apr;39(4):273-7. [15758618]
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