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Related Concept Videos

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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.
In gastric emptying studies, a meal's liquid and solid...
Histology of the Large Intestine01:26

Histology of the Large Intestine

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.
The innermost mucosa layer comprises simple columnar epithelium, lamina propria, and muscularis mucosae. This layer is primarily populated with absorptive cells, tasked with water absorption, and goblet cells, responsible for secreting mucus to...
Histology of the Gastrointestinal (GI) Tract01:20

Histology of the Gastrointestinal (GI) Tract

The GI tract, from beginning to end, is made up of four continuous tissue layers that adjust their structure according to their specific roles. These layers, from innermost to outermost, are known as the mucosa, submucosa, muscularis, and serosa, which are continuous with the mesentery.
The mucosa is sometimes called a mucous membrane due to its mucus-secreting features. This membrane is composed of epithelium, which directly interacts with ingested substances, and the lamina propria, a layer...
Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
Histology of the Small Intestine01:27

Histology of the Small Intestine

The small intestine exhibits a unique histological structure that significantly enhances its function in digestion and nutrient absorption. These structures include circular folds, villi, and various specialized cells that collectively facilitate the digestion of food.
The intestinal lining features transverse folds called circular folds, each housing fingerlike projections known as intestinal villi. These villi are covered by a layer of simple columnar epithelium, also referred to as...

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Related Experiment Video

Updated: Jul 17, 2026

Establishment of Coloproctitis Cancer Model in Mice and Evaluation of Therapeutic Effect of Chinese Medicine
06:24

Establishment of Coloproctitis Cancer Model in Mice and Evaluation of Therapeutic Effect of Chinese Medicine

Published on: October 13, 2023

[Conventional histological diagnostics in coloproctology].

W A Meier-Ruge1, E Bruder

  • 1Institut für Pathologie der Universität Basel, Schönbeinstrasse 40, 4031 Basel, Switzerland. meier-ruge@bluewin.ch

Der Pathologe
|February 7, 2007
PubMed
Summary

Immunohistochemistry aids coloproctology diagnosis, with specific stains identifying hypoganglionosis and desmosis. Enzyme histochemistry remains crucial for ultrashort Hirschsprung

Area of Science:

  • Gastroenterology
  • Histopathology
  • Coloproctology

Context:

  • Histopathological diagnosis in coloproctology has advanced with immunohistochemical (IHC) methods.
  • Formalin-fixed, paraffin-embedded tissues are standard for these analyses.

Purpose:

  • To review the utility of IHC and enzyme histochemistry in diagnosing coloproctological conditions.
  • To highlight the complementary roles of various histopathological techniques.

Summary:

  • IHC stains like S100, cathepsin D, and picrosirius red are effective for diagnosing hypoganglionosis and desmosis.
  • CD 117 IHC aids in evaluating Cajal cells.
  • Acetylcholinesterase (AChE) enzyme histochemistry is indispensable for diagnosing ultrashort Hirschsprung's disease, as IHC cannot replace it.

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Diagnosis of Hirschsprung's Disease by Immunostaining Rectal Suction Biopsies for Calretinin, S100 Protein and Protein Gene Product 9.5
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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

Published on: July 28, 2010

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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

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  • Enzyme histochemistry requires native cryostat sections, necessitating organized biopsy handling.
  • Impact:

    • Improved diagnostic accuracy for specific myenteric plexus and muscularis propria disorders.
    • Defines the essential role of enzyme histochemistry for certain congenital conditions.
    • Emphasizes the need for optimized biopsy procedures for enzyme histochemistry.