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Ultrastructure and function of the excretory organ of Ascaris lumbricoides L. (Nematoda)

Zeitschrift für Zellforschung und Mikroskopische Anatomie, ISSN: 0302-766X, Vol: 113, Issue: 4, Page: 581-608
1971
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  • Citations
    5
    • Citation Indexes
      5

Article Description

The Excretory organ (H-system) of Ascaris lumbricoides has been investigated electronmicroscopically. In adult animals this single-cell-organ embedded in the lateral lines extends from the nerve ring to approximately the middle of the body. In the second quarter of the body it lacks a continuous canal lumen, and it seems to be degenerated. In all of the other regions (except the stem leading to the excretory pore) it consists of two zones. The inner zone lining the canal lumen contains several extraplasmatic spaces; at least those placed the farthest inside communicate with the canal lumen. The outer cell membrane shows many infoldings, some of which extend deeply into the cytoplasm. The tissue of the lateral line adjacent to the canal system contains very many intercellular spaces which build a coherent intracellular "rainage"-system. Experiments have been performed in order to localize the ATPase activity histochemically. Possible mechanisms for the forming of the excretory fluid are discussed under consideration of physiological results already published. © 1971 Springer-Verlag.

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