Atlas of plant and animal histology

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Glandular epithelium


INTRAEPITHELIAL CELLS

Pseudostratified epithelium
Intraepithelial secretory cells
Cilium
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Epithelim: caliciform glands
Organ: lung, respiratory tract, pseudostratified ciliated epithelium with intraepithelial unicellular glands.
Species: pig (Sus scrofa domesticus; mammal)
Technique: 8 μm paraffin section stained with PAS-haematoxylin.

The image is from the respiratoty ducts.
Cursor over the pig to see where the image comes from.

Caliciform cells are intraepithelial cells scattered in the covering epithelium of the intestine (small and large intestine), and larger respiratory ducts (trachea and bronchi). Caliciform cells resemble a calyx, with the apical part wider than the basal one. The nucleus is located in the basal part and the secretory vesicles are located toward the apical part (stained in red in this image). The release of the secretory products is by merocrine secretion, after a cholinergic stimulus from the autonomous system. After every secretion event, caliciform cell becomes thinner and starts to synthesize new molecules to be released in the next secretion event. The time between two releases is around 1 or 2 hours.

More images

Caliciform cells in the small intestine epithelium. These cells secrete mucus that covers the surface of the epithelium (note de red line lining the free epithelial surface).
Home / Animal tissues / Epithelium / Glandular / Intraepithelial cells
Updated: 2019-06-30. 21:38
Atlas of Plant and Animal Histology
Dep. of Functional Biology and Health Sciences.
Faculty of Biology.
University of Vigo
Spain

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