Pseudostratified columnar epithelium

Pseudostratified columnar epithelium

Illustration depicting Pseudostratified Ciliated Columnar Epithelium.
Identifiers
Code TH H2.00.02.0.02021

Anatomical terminology

A pseudostratified epithelium is a type of epithelium that, though comprising only a single layer of cells, has its cell nuclei positioned in a manner suggestive of stratified epithelia. As it rarely occurs as squamous or cuboidal epithelia, it is usually considered synonymous with the term pseudostratified columnar epithelium.

The term pseudostratified is derived from the appearance of this epithelium in section which conveys the erroneous (pseudo means almost or approaching) impression that there is more than one layer of cells, when in fact this is a true simple epithelium since all the cells rest on the basal lamina. The nuclei of these cells, however, are disposed at different levels, thus creating the illusion of cellular stratification. Not all ciliated cells extend to the luminal surface; such cells are capable of cell division providing replacements for cells lost or damaged.

Pseudostratified epithelia function in secretion or absorption. If a specimen looks stratified but has cilia, then it is a pseudostratified ciliated epithelium, since stratified epithelia do not have cilia.

Examples

Additional images

References

  1. Höfer, D.; Drenckhahn, D. (1996). "Cytoskeletal differences between stereocilia of the human sperm passageway and microvilli/stereocilia in other locations". Anatomical Record. 245 (1): 57–64. doi:10.1002/(SICI)1097-0185(199605)245:1<57::AID-AR10>3.0.CO;2-8. PMID 8731041.
  2. Robbins, Cotran. Pathologic Basis of Disease. p. 1080.
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