The ultrastructure of the heart of Oniscus asellus L. and Asellus aquaticus L. (Crustacea,Isopoda) |
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Authors: | Dr Harald Otto Liebich |
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Institution: | (1) Cellular Cardiology Research Group, Zoological Laboratory, University of Bergen, Norway;(2) Zoological Laboratory, Allégt. 41, N-5014 Bergen, Norway |
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Abstract: | Summary The endocardium of Oniscus asellus L. and Asellus aquaticus L. consists of lipid cells. The epicardium consists of a layer of cells with a vesiculated cytoplasm covered by a thick extracellular fibrous sheet. The myocardium is a single layer of cells, the sarcolemma invaginates at Z disc level forming transverse tubules, and longitudinal tubules branch off from these. At the A-I level' longitudinal tubules form transverse systems, which form couplings with the sarcoplasmic reticulum. The sarcoplasmic reticulum appears as perforated sheets enveloping the myofibrils. Two types of nerve terminal are found: one is embedded in a myocardial cell process, the other lies in a myocardial cell depression. They contain clear and dense-cored synaptic vesicles.This work was supported by grants from the Norwegian Research Council for Science and the Humanities |
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Keywords: | Cardiac ultrastructure Innervation Isopoda (Crustacea) |
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