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Fine Structure of the Heart Tube and Its Cardiac Muscle Cells in the Spider, Araneus ventricosus  

Choi, Jae-Young (Department of Biological Sciences, Dankook University)
Moon, Myung-Jin (Department of Biological Sciences, Dankook University)
Publication Information
Applied Microscopy / v.33, no.4, 2003 , pp. 325-333 More about this Journal
Abstract
Fine structural characteristics of the heart tube and its cardiac muscle cells in spider, Araneus ventricosus are investigated by both of scanning and transmission electron microscopes. The heart tube of the spider is extended mid-dorsally along the anterior part of the abdomen, and is consisted of the thin outer layer of connective tissue (epicardium) and the thick muscle layer (myocardium). The myocardium in the spider has a typical fanlike spiral structure toward anterior part put across between the muscle fibers. Therefore, it did not give rise to the intima, and muscle cells are in direct contact to the hemolymph. The heart tube appeared to be three pairs of ostia and numerous hemocytes accumulated at the inner surface of the myocardial layer. Among several kinds of the hemocytes, the oenocytoids are the most predominant hemocytes accumulated along the myocardial folds which stretched toward heart lumen. The heart muscle cells are cross striated, branched, and multinucleated. They contain a lot of mitochondria, which provide for the continuous energy demands of the heart. Thread-like ganglion on the dorsal side of the heart tube gives off axons that innervate the heart muscle cells.
Keywords
Araneus ventricosus; Cardiac muscle cell; Fine structure; Heart tube; Spider;
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