Interlobular excretory ducts of mammalian salivary glands: structural and histochemical review

The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology
B TandlerCarleton J Phillips

Abstract

In the major salivary glands of mammals, excretory ducts (EDs) succeed striated ducts. They are for the most part interlobular in position, although their proximal portions sometimes are on the periphery of a lobule, where they occasionally retain some of the structural features of striated ducts. Based on a survey of a broad range of mammalian species and glands, the predominant tissue type that composes EDs is pseudostratified epithelium. In some species, there is a progression of epithelial types: the proximal EDs are composed of simple cuboidal or columnar epithelium that, in the excurrent direction, usually gives way to the pseudostratified variety. Secretory granules are visible in the apical cytoplasm of the principal cells of the EDs of only a few species, but histochemistry has shown the presence of a variety of glycoproteins in these cells in a spectrum of species. Moreover, the latter methodology has revealed the presence of a variety of oxidative, acid hydrolytic, and transport enzymes in the EDs, showing that, rather than simply acting as a conduit for saliva, these ducts play a metabolically active role in gland function. It is difficult to describe a "typical" mammalian ED because it can vary along its length and...Continue Reading

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Citations

Aug 19, 2015·The Journal of Veterinary Medical Science·Hassadin BoonsrirojChun-Ho Park
Jul 16, 2008·Physiological Reviews·Dirk Heitzmann, Richard Warth
Dec 5, 2012·Acta Histochemica Et Cytochemica·Toshiyuki MatsuzakiKuniaki Takata
Jan 30, 2021·Journal of Mammalogy·Carleton J PhillipsHugh H Genoways

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