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Light- and electronmicroscopical observations on the saccus vasculosus of the rainbow trout

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Summary

The saccus vasculosus of the rainbow trout, a sac-like outgrowing of the basis of the diencephalon consists of a strongly undulated epithelial wall, separating the cerebrospinal fluid from the endomeningeal matrix fluid. This epithelium is built up by highly specialized coronet cells, glial cells and peculiar so-called pseudo-coronet cells. The coronet cells extend from the ventricular- to the meningeal border. Morphological evidence is put forward indicating that transport of low molecular material might be the main function of these cells. Several cytochemical data support this hypothesis. A possible repulsion and renewal of globules of the coronet cells may represent steps in the functional cycle of these cells. Concerning the transport function, the observation of open connections between the lumina of the blood sinuses and the endomeningeal spaces might be important.

Observations on the synaptic pattern in the epithelium suggest a possible nerve control of the functional activity of the saccus vasculosus via the glial elements.

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Authors and Affiliations

  1. Zoological Laboratory, Department of Histology, State University of Utrecht, the Netherlands

    W. F. Jansen & W. F. G. Flight

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  1. W. F. Jansen
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  2. W. F. G. Flight
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Additional information

The authors thank Prof. Dr.J. C. van de Kamer and Dr.F. C. G. van de Veerdonk for critically reading the manuscript.

The second author is responsible for the electronmicroscopical part of the present paper.

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Jansen, W.F., Flight, W.F.G. Light- and electronmicroscopical observations on the saccus vasculosus of the rainbow trout. Z.Zellforsch 100, 439–465 (1969). https://doi.org/10.1007/BF00571497

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  • DOI: https://doi.org/10.1007/BF00571497

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