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Related Concept Videos

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
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Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
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The large intestine, a vital component of the gastrointestinal tract, is structured with four main layers: the mucosa, submucosa, muscularis, and serosa. Each layer performs a distinct role in facilitating the smooth functioning of the large intestine.
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Related Experiment Video

Updated: Apr 5, 2026

Gastrointestinal Motility Monitor GIMM
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Segmental colonic length and mobility.

M Phillips1, A Patel1, P Meredith1

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, UK.

Annals of the Royal College of Surgeons of England
|August 15, 2015
PubMed
Summary

Rectosigmoid length significantly influences total colon length. Ascending and descending colon segments are more mobile than traditionally taught, impacting colorectal procedures and potentially colonoscopy difficulty in females. Jackson's membrane is common.

Keywords:
AscendingColonDescendingMesocolonSigmoidTransverse

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Area of Science:

  • Anatomy
  • Surgical Anatomy

Background:

  • Colonic length and mobility vary regionally, impacting surgical and endoscopic procedures.
  • Accurate anatomical understanding is crucial for effective colorectal interventions.

Purpose of the Study:

  • To refine anatomical knowledge of the human colon by detailing segmental lengths and mobility.
  • To investigate the relationship between colonic segments and overall colonic length variability.

Main Methods:

  • Examination of 35 cadavers to measure lengths of the caecum, ascending, transverse, descending, and rectosigmoid colon.
  • Characterization of colonic mobility based on mesenteric attachments.
  • Documentation of Jackson's membrane presence.

Main Results:

  • Mean total colonic length was 131.2cm (SD: 13.4cm).
  • Rectosigmoid length was the best predictor of total colonic length.
  • Significant mobility observed in the ascending (66%) and descending (33%) colon, more common in females.
  • Jackson's membrane present in 66% of subjects.

Conclusions:

  • Rectosigmoid length variability is a primary driver of total colonic length variation.
  • Ascending and descending colon segments exhibit greater mobility than traditionally assumed, necessitating a revision of anatomical teaching.
  • Ascending colon mobility in females may explain challenges during colonoscopy.
  • Jackson's membrane is a frequent anatomical finding.