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Related Concept Videos

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Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
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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.
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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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The small intestine is primarily responsible for digestion and nutrient absorption. It spans from the pyloric sphincter to the ileocecal valve and connects to the large intestine.
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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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Updated: Jan 9, 2026

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Exploring the villus.

Arzu Ensari1, Michael N Marsh2

  • 1Department of Pathology, Ankara University Medical School, Sihhiye 06100, Ankara, Turkey.

Gastroenterology and Hepatology From Bed to Bench
|July 18, 2018
PubMed
Summary
This summary is machine-generated.

The small intestinal villus epithelium, crucial for nutrient absorption, relies on interactions between epithelial cells, the extracellular matrix, and myofibroblasts for its structure and function. This review details these complex relationships and their dynamic nature.

Keywords:
EpitheliumPermeabilitySmall intestinal villus

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Tissue Engineering

Background:

  • The small intestinal villus epithelium comprises enterocytes, goblet cells, and argentaffin cells, originating from crypt epithelium cell division.
  • Enterocytes form a vital barrier for nutrient digestion, absorption, and transport, with their differentiation dependent on cytoskeletal proteins, ECM receptors, and ion transporters.
  • The basement membrane, derived from mesenchyme, is critical for villus and crypt morphogenesis, polarity, and maintaining tissue structure.

Purpose of the Study:

  • To review the structural and functional aspects of the small intestinal villus.
  • To highlight the cooperative roles of epithelial and mesenchymal components in villus formation and maintenance.
  • To discuss the dynamic regulation of villus structure by extracellular matrix and myofibroblasts.

Main Methods:

  • Review of existing literature on small intestinal villus structure and function.
  • Analysis of the interplay between epithelial cells, basement membrane, and subepithelial myofibroblasts.
  • Examination of the microvasculature and lacteals within the lamina propria.

Main Results:

  • The villus epithelium's integrity and function depend on cytoskeletal proteins, ECM, and cell-matrix interactions.
  • Subepithelial myofibroblasts play key regulatory roles in tissue morphogenesis, remodeling, epithelial development, and repair processes.
  • The basement membrane provides essential structural support and influences cell differentiation and polarity.

Conclusions:

  • Villus structure and function are maintained through intricate cooperation between epithelial and mesenchymal elements.
  • Subepithelial myofibroblasts are central to regulating villus tissue dynamics, including repair and fibrosis.
  • Small intestinal villi exhibit remarkable plasticity, rapidly adapting to internal and external influences.