Glial elements in the nervous system of earthworm, Eisenia fetida
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1
University of Pécs, Department of Exerimental Zoology and Neurobiology, Faculty of Science, Hungary
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2
University of Pécs, Department of Sportbiology, Faculty of Science, Hungary
In Invertebrates, several types of glial elements have been identified, similarly to those of Vertebrates. Apart from their isolating and supporting functions, there may be a role for them in the elemination of dying nerve elements, development and regeneration of the nervous system and transport of nutrients toward the nerve cells with on the ganglia. The types and roles of glial elements in the ventral cord ganglia are not fully known yet in Annelids. We have found the following glial elements in the CNS of Eisenia: (1) neurilemmal glial cells, (2) subneurilemmal- (3) supporting-nutrifying glial cells, (4) myelin-sheath forming glial cells. In this study we characterize the neurilemmal and the supporting-nutrifying glial cells. With the aid of immunocytochemistry we found GFAP-positive cells on the surface of neurons in the ganglia. By morphology these brush like cells extend long filopodia along neuronal cell bodies and axons. These structures are especially obvious at the electronmicroscopic level. Both the glial cell bodies and the filopodia contain granules of different densities. Some granules are attached to the cell membrane while others lay further away from the cell surface. With high magnification it is visible that small vesicles are shed from the large granules and move towards the cell membrane and form exocytotic profiles. In a few cases vesicles were seen within the large granules. Other granules contain regular, crystallin-like structures. Filopodia and neuronal membranes occasionally form tight junctions thus providing a channel for material transport between glia and neurons. The neurilemmal cells show similarities with the celomatic cells in their morphology and development; furthermore they can be stained with toluidine blue. In accord with former data, these cells are mobile and can be found within or nearby the neurilemmal sheath. These cells may play a role in material transport between the central nervous system and the periphery.
Conference:
IBRO International Workshop 2010, Pécs, Hungary, 21 Jan - 23 Jan, 2010.
Presentation Type:
Poster Presentation
Topic:
Cellular neuroscience
Citation:
Csoknya
M,
Gábriel
R and
Wilhelm
M
(2010). Glial elements in the nervous system of earthworm, Eisenia fetida.
Front. Neurosci.
Conference Abstract:
IBRO International Workshop 2010.
doi: 10.3389/conf.fnins.2010.10.00043
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Received:
20 Apr 2010;
Published Online:
20 Apr 2010.
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Correspondence:
Mária Csoknya, University of Pécs, Department of Exerimental Zoology and Neurobiology, Faculty of Science, Pécs, Hungary, 5-ht@ttk.pte.hu