Document Detail

The respiratory epithelium. I. Human bronchus.
MedLine Citation:
PMID:  355649     Owner:  NLM     Status:  MEDLINE    
Six morphologic cell types comprise the human bronchial epithelium: basal cells that do not reach the bronchial lumen, neurosecretory cells (Kulchitsky's cells, K-cells, or small granule cells) that rarely reach the lumen, and indifferent cells, mucous cells [small mucous granule cells (SMGC) and mucous goblet cells], ciliated cells, and ciliated-mucous cells that do reach the lumen. Ciliated-mucous cells bearing fully developed cilia and containing mucous granules are seen only occasionally. Three of the cell types that reach the lumen are microvillus covered and do not bear cilia. The microvillus-covered nonciliated cells are: 1) neurosecretory cells, 2) indifferent cells, and 3) mucous cells. Neurosecretory cells contain characteristic dense core granules. Such cells rarely reach the lumen. Indifferent cells are rarely seen. They have a pale cytoplasm and show no evidence of either ciliary or mucous differentiation. Similar cells are observed showing early signs of either ciliary or mucous differentiation or even both types of differentiation in the same cell. Mucous cells comprise the vast majority of microvillus-covered cells. They present either as SMGC with a few small mucous granules or as goblet cells, filled with mucus. These columnar cells are characterized ultrastructurally by dense cytoplasm and a well-developed endoplasmic reticulum and Golgi apparatus. The microvilli are coated with a glycocalyx that binds colloidal iron more avidly than that of either cilia or microvilli of ciliated cells. Possible interrelationships between the different cell types in normal epithelium are discussed.
E M McDowell; L A Barrett; F Glavin; C C Harris; B F Trump
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Journal of the National Cancer Institute     Volume:  61     ISSN:  0027-8874     ISO Abbreviation:  J. Natl. Cancer Inst.     Publication Date:  1978 Aug 
Date Detail:
Created Date:  1978-10-25     Completed Date:  1978-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7503089     Medline TA:  J Natl Cancer Inst     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  539-49     Citation Subset:  IM    
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MeSH Terms
Bronchi / cytology,  secretion,  ultrastructure*
Cell Differentiation
Cilia / ultrastructure
Cytoplasmic Granules / ultrastructure
Epithelium / ultrastructure
Microscopy, Electron
Microscopy, Electron, Scanning
Microvilli / ultrastructure
Mucus / secretion

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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