NDLI: Electron microscopic study of intestinal epithelium of Saccoglossus mereschkowskii (Enteropneusta, Hemichordata)

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Electron microscopic study of intestinal epithelium of Saccoglossus mereschkowskii (Enteropneusta, Hemichordata)

Cell and Tissue Biology : Volume 5, Issue 3, June 2011

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Cell and Tissue Biology : Volume 5, Issue 1, February 2011

Cell and Tissue Biology : Volume 4

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Cell and Tissue Biology : Volume 1

Electron microscopic study of intestinal epithelium of Saccoglossus mereschkowskii (Enteropneusta, Hemichordata)

Content Provider	Springer Nature Link
Author	Stolyarova, M. V.
Copyright Year	2011
Abstract	The epithelium of the hepatic region of the intestine in Saccoglossus mereschkowskii, a representative of enteropneusts (Enteropneusta, Hemichordata), a group located at the base of Chordata, has been studied by using electron microscopy. The ultrastructure of ciliated and granular epithelial cells, elements of the intraepithelial nerve layer, and intercellular junctions are characterized. The data on the details of the structure of the ciliary apparatus and the system of ciliary rootlets are presented. Justification is provided for the presence of a complicated construction in the ciliated cells, a supportive carcass of cilia that performs a mechanical stabilizing function, and possibly the synchronization of the ciliary movement. The existence of cilia with two centrioles is considered as adaptation to the high functional load on the ciliary apparatus. Well-developed bundles of myofilaments have been revealed in the cytoplasm of the basal parts of ciliated cells, which characterizes these cells as epitheliomuscular. Peculiarities indicating the role of ciliated cells in absorption are described, as well as the capability of these cells for balloon-like secretion. Data are presented on the accumulation of reserved nutritional substances in the cell cytoplasm in the form of lipids and glycogen. With respect to their function, ciliated cells are determined as the ciliated secretory-absorptive epitheliomuscular cells. The location of secretory granules in both apical and basal parts of granular cells indicates the exocrine-endocrine function of these cells. There are no typical endocrine cells in the intestinal epithelium of S. mereschkowskii. Several types of granules are described in the cytoplasm of nerve fibers. Junctions between nerve fibers and basal parts of ciliated and granular epithelial cells have been revealed; the neural regulation of the contractile and secretory functions of epithelial cells is assumed. The intestinal epithelium of enteropneusts is presumed to contain a regulatory neuroendocrine system composed of receptor cells of the open type, secretory endocrine-like cells, and of nerve elements of the nervous layer.
Starting Page	406
Ending Page	416
Page Count	11
File Format	PDF
ISSN	1990519X
Journal	Cell and Tissue Biology
Volume Number	5
Issue Number	4
e-ISSN	19905203
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-08-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	comparative histology and cytology invertebrates epithelia Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology

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