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Colitis pp 5-24 | Cite as

The Normal Biopsy: Colonic and Ileal Mucosa and Submucosa

  • Anne Jouret-Mourin
  • Peter Van Eycken
  • Maria Leo
  • Karel Geboes
Chapter

Abstract

The digestive tract is a hollow tube consisting throughout of three coats or layers. The first layer, the mucosa, is made up of an epithelial lining which borders on the lumen of the bowel and rests upon a basement membrane, the lamina propria and the muscularis mucosae. The mucosa of the colon has a smooth surface and is composed of tubular parallel crypts embedded in a loosely arranged stroma. The mucosa of the ileum is composed of fingerlike villi and displays a number of specific features including the shorter villi and more epithelial goblet cells on the surface than the proximal small intestine and the presence of Peyer’s patches. The second coat is the submucosa. The muscularis propria, the third layer, is composed of two layers of smooth muscle separated by a thin layer of connective tissue in which the ganglionated myenteric plexus (Auerbach’s) can be observed. The subserosa is composed of loose areolar tissue covered by mesothelium where the tract borders on the body cavity (serosa). Endoscopic biopsies are limited to the mucosa and upper part of the submucosa. A good understanding of the normal histology of the mucosa and submucosa is essential for analysis of endoscopic biopsies of the ileum and the colon.

Keywords

Crypt Mucosa Architecture Innominate groove Intestinal epithelial cell Goblet cell Enteroendocrine cell Paneth cell Pigmented macrophage Foamy macrophage Muciphage Neutrophil Cytokine Fibroblast Collagen Basement membrane Lymphocyte Lamina propria Eosinophil Mast cell Inter-epithelial lymphocyte Peyer’s patches Macrophage Muscularis mucosae Submucosa Adhesion molecule Integrin Selectin 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Anne Jouret-Mourin
    • 1
  • Peter Van Eycken
    • 2
  • Maria Leo
    • 3
  • Karel Geboes
    • 4
    • 5
  1. 1.Department of PathologyCliniques Universitaires St Luc, UCLBrusselsBelgium
  2. 2.Department of PathologyZiekenhuis Oost-Limburg ZOLGenkBelgium
  3. 3.Departments of Pathology and Surgical SciencesUniversity Hospital San Giovanni di Dio, University of CagliariCagliariItaly
  4. 4.Department of PathologyGhent University HospitalGhentBelgium
  5. 5.Department of PathologyKU LeuvenLeuvenBelgium

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