Smooth muscle in the gut and airways

  • Giorgio Gabella
Part of the Electron Microscopy in Biology and Medicine book series (EMBM, volume 8)

Abstract

The main muscle component of the gastrointestinal tract of vertebrates is a layer of smooth muscle known as the muscularis externa or muscle coat (Fig. 7-1). Additional musculature is found in the muscularis mucosae, in the core of intestinal villi, in the media of blood vessels, and as individual muscle cells in the core of villi. The muscle coat varies greatly in thickness in different regions of the gut and in different animal species. In the ileum of man it measures, at rest, over one millimeter, while in a mouse it is less than 50 micrometers. In a given animal, the thickness of the muscle coat in the jejunum and ileum is uniform around the circumference and along the length of the organ. In the initial part of the duodenum, the muscle is almost twice as thick as in the rest of the small intestine. In the large intestine the musculature is more abundant than in the small intestine. In any part of the gut, upon full contraction the thickness of the muscle coat can treble.

Keywords

Peri Fibril Mast Cali Verse 

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References

  1. 1.
    Walus KM, Jacobson ED: Relationship between small intestinal motility and circulation. Am J Physiol 241: G1–G15, 1981.PubMedGoogle Scholar
  2. 2.
    Chou CC: Relationship between intestinal blood flow and motility. Annu Rev Physiol 44: 29–42, 1982.PubMedCrossRefGoogle Scholar
  3. 3.
    Taxi J: Contribution à l’étude des connexions des neurones moteurs du système nerveux autonome. (1983) Ann Sei Nat Zool 7: 413–674, 1983.Google Scholar
  4. 4.
    Mikkelsen HB, Thuneberg L, Wittrup IH: Selective double staining of interestitial cells of Cajal and macrophage-like cells in small intestine by an improved supravital methylene blue technique combined with FITC-dextran uptake. Anat Embryol 178: 191–195, 1988.PubMedCrossRefGoogle Scholar
  5. 5.
    Li P-L: Neue Beobachtungen über die Struktur der Zirkulärmuskels im Dünndarm bei Wirbeltieren. Z Anat Entwicklungsgesch 107: 212–222, 1937.CrossRefGoogle Scholar
  6. 6.
    Bennett T, Cobb JLS: Studies on the avian gizzard: morphology and innervation of the smooth muscle. Z Zellforsch 96: 183–195, 1969.CrossRefGoogle Scholar
  7. 7.
    Gabella G: The cross-ply arrangement of collagen fibres in the submucosa of the mammalian small intestine. Cell Tissue Res 248: 491–497, 1987.PubMedCrossRefGoogle Scholar
  8. 8.
    Komuro T: The lattice arrangement of the collagen fibres in the submucosa of the rat small intestine: scanning electron microscopy, Cell Tissue Res 251: 117–121, 1988.PubMedCrossRefGoogle Scholar
  9. 9.
    Ferner H, Müller I: Mikroskopische Anatomie und Architektonik der membranösen Trachealwand des Menschen. Z Mikrosk Anat Forsch 67: 571–591.Google Scholar
  10. 10.
    Amiri MH, Gabella G: Structure of the guinea-pig trachea at rest and in contraction. Anat Embryol 178: 389–397, 1988.PubMedCrossRefGoogle Scholar
  11. 11.
    Macklin CC: The musculature of the bronchi and lungs. Physiol Rev 9: 1–60, 1929.Google Scholar
  12. 12.
    Cameron AR, Bullock CG, Kirkpatrick CT: The ultrastructure of bovine tracheal smooth muscle. J Ultrastruct Res 81: 290–305, 1982.PubMedCrossRefGoogle Scholar
  13. 13.
    Böck P, Stockinger L: Light and electron microscopic identification of elastic, elaunin and oxytalan fibers in human tracheal and bronchial mucosa. Anat Embryol 170: 145–153, 1984.PubMedCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Giorgio Gabella
    • 1
  1. 1.Department of Anatomy and Developmental BiologyUniversity College LondonLondonEngland

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