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Über den Charakter synaptoider Endstrukturen markloser Fasern im Epiphysenpolster (Pulvinar corporis pinealis) der Gelbbauchunke (Bombina variegata L.)

On the properties of synaptoid terminations of unmyelinated fibers in the pulvinar corporis pinealis in Bombina variegata (L.)

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Summary

The synaptoid terminations of granulated unmyelinated fibers in the neuropile of the pulvinar corporis pinealis inBombina variegata have been studied by light and electron microscopy.

Vesicles with the structural properties of synaptic vesicles in the synaptoid terminations in the pulvinar corporis pinealis as well as identically shaped vesicles in the plexiform regions of the pineal organ and in unmyelinated fibers terminating between ependymal cells of the subcommissural organ can be stained selectively by aid of the zinciodide-osmium method. On the other hand granules with electron dense core in the pulvinar do not react.

Size and number of the granulated vesicles in the axons of the pulvinar cannot be influenced by injection of reserpine or the benzoquinolizine derivative Ro 4-1284.

The possible mechanism of discharge of secretory material and the probability of the presence of a cholinergic mechanism are discussed.

Zusammenfassung

Die synaptoiden Endformationen markloser, granulierter Axone im Pulvinar corporis pinealis vonBombina variegata wurden licht- und elektronenmikroskopisch untersucht.

Mit Hilfe der Zn-J-OsO4-Methode lassen sich Vesikel vom Typ synaptischer Bläschen in den Endformationen der Fasern im Pulvinar, in den plexiformen Zonen der Epiphyse sowie in den Endigungen markloser Fasern im sekretorischen Ependym des Subcommissuralorgans selektiv darstellen. Die in den Axonen des Epiphysenpolsters vorhandenen Granula mit elektronendichtem Kern reagieren nicht.

Durch Injektion von Reserpin sowie dem Benzochinolizin-Derivat Ro 4-1284 ließen sich Aussehen und Dichte der Granula mit dichtem Inhalt nicht beeinflussen.

Der Charakter der Vesikel und Granula und der mögliche Mechanismus ihrer Entleerung werden diskutiert.

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Authors and Affiliations

  1. Zoologisches Institut der Universität München und Max-Planck-Institut für Verhaltensphysiologie, Seewiesen

    Helmut Altner & Horst Bayrhuber

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  1. Helmut Altner
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  2. Horst Bayrhuber
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Altner, H., Bayrhuber, H. Über den Charakter synaptoider Endstrukturen markloser Fasern im Epiphysenpolster (Pulvinar corporis pinealis) der Gelbbauchunke (Bombina variegata L.). Z.Zellforsch 96, 600–608 (1969). https://doi.org/10.1007/BF00973336

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