Atlas of Plant and Animal Histology

Animal tissue
Glandular epithelium


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

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).

Updated: 2016-01-18. 18:03