The fine structure of the muscle system in the female of the orthonectid Intoshia variabili (Orthonectida) |
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Authors: | George S Slyusarev |
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Institution: | Department of Invertebrate Zoology, Faculty of Biology and Soil Science, Saint-Petersburg State University, Universitetskaya nab. 7/9, 199034 St-Petersburg, Russia |
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Abstract: | The contractile system of the female Intoshia variabili (Orthonectida) consists of smooth muscles. The attachment of the longitudinal muscle fibres at the anterior and the posterior tips of the body is rather peculiar, accomplished by means of elongated terminal muscle cells piercing through several ciliated cells. In the last ciliated cell, the muscle cell invaginates the ciliated cell basal membrane almost up to the ciliated cell surface. Here, around the protrusion terminus, there is an electron‐dense zone in contact with the cilia rootlets. |
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Keywords: | Mesozoa Orthonectida muscle system ultrastructure |
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