Jejunum and villi: Structural basis of intestinal absorption

  • Torao Yamamoto
Part of the Electron Microscopy in Biology and Medicine book series (EMBM, volume 4)


The jejunum is the main portion of the intestine involved in the digestion and absorption of nutrients in the digestive canal. According to an old concept, the food materials were believed to be first broken down into micromolecules, such as amino acids or monosaccharides, by digestive enzymes in the lumen of the digestive canal and then absorbed through the epithelial lining into the blood capillaries or lymphatics. However, since it has been revealed that terminal digestive enzymes such as disaccharidases and dipeptidases are concentrated in the brush border membrane of absorptive cells (1,2), this concept had to be revised.


Tight Junction Absorptive Cell Apical Cytoplasm Intestinal Disaccharidase Microvillous Membrane 
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Copyright information

© Martinus Nijhoff Publishing, Boston 1988

Authors and Affiliations

  • Torao Yamamoto
    • 1
  1. 1.Department of Anatomy, Faculty of MedicineKyushu UniversityFukuokaJapan

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