The structure of the proboscis musculature in Baseodiscus delineatus (Delle Chiaje, 1825) (Heteronemertea) and the comparative analysis of the proboscis musculature in heteronemerteans

The structure of the proboscis musculature in Baseodiscus delineatus (Delle Chiaje, 1825)... The proboscis musculature was studied in the nemertean Baseodiscus delineatus using confocal laser scanning and electron transmission microscopy. Three muscle layers were differentiated in the proboscis wall: the outer-longitudinal, the diagonal, and the inner-circular layer. The endothelium consists of two cell types: apical supportive cells with rudimentary cilia and subapical myocytes making up the inner-circular musculature of the proboscis. The supportive cells have thin processes attached to the basal extracellular matrix and their perikarya are spread over the apical surfaces of myocytes. The endothelium of B. delineatus is characterized by a folded basal layer of the extracellular matrix and by different heights of myocyte processes, giving an impression that the inner-circular musculature is multilayered. Comparative analysis shows that the diagonal musculature of Baseodiscus is not homologous to that of other heteronemerteans. An assumption is made that the inner-circular muscles have endothelial origin in all heteronemerteans. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

The structure of the proboscis musculature in Baseodiscus delineatus (Delle Chiaje, 1825) (Heteronemertea) and the comparative analysis of the proboscis musculature in heteronemerteans

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074011060101
Publisher site
See Article on Publisher Site

Abstract

The proboscis musculature was studied in the nemertean Baseodiscus delineatus using confocal laser scanning and electron transmission microscopy. Three muscle layers were differentiated in the proboscis wall: the outer-longitudinal, the diagonal, and the inner-circular layer. The endothelium consists of two cell types: apical supportive cells with rudimentary cilia and subapical myocytes making up the inner-circular musculature of the proboscis. The supportive cells have thin processes attached to the basal extracellular matrix and their perikarya are spread over the apical surfaces of myocytes. The endothelium of B. delineatus is characterized by a folded basal layer of the extracellular matrix and by different heights of myocyte processes, giving an impression that the inner-circular musculature is multilayered. Comparative analysis shows that the diagonal musculature of Baseodiscus is not homologous to that of other heteronemerteans. An assumption is made that the inner-circular muscles have endothelial origin in all heteronemerteans.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Mar 16, 2012

References

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