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Osservazioni istologiche, istochimiche ed ultrastrutturali sui tentacoli di Vaginulus borellianus (Colosi), Gastropoda Soleolifera

Histological, histochemical and ultrastructural observations on the tentacles of Vaginulus borellianus (Colosi)

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Summary

The tentacle structure of Vaginulus borellianus (Colosi) has been examined with the ligth and electron microscope; the following conclusions have been reached: a) The olfactory sensory epithelium in the distal portion of both tentacles (superior and inferior) is composed of sensory neurons, supporting cells, and basal cells. The dendrites of the neurons bear cilia and a great number of microvilli apically, whereas the apical portion of the supporting cells is formed by cylindrical plasmatic processes. These are long and thick and have an axial filament. b) The cytochemistry and ultrastructure of the unicellular glands enclosed within the dermo-muscular layer of the tentacles indicate that a neuroendocrine complex of the kind described in Helix, Arion and other Stylommatophores does not occur in this species. c) The gland located in the lower tentacles (belonging to Semper's organ) is a tubular formation, with its opening at the outer surface. Its secretion, mostly mucous, is very similar to that of mucocytes and foot glands of this species and other molluscs.

Riassunto

Le ricerche condotte sui tentacoli di Vaginulus borellianus hanno permesso di stabilire: a) l'esistenza nella porzione distale dei tentacoli (superiori ed inferiori) di un epitelio sensoriale di tipo olfattivo costituito da neuroni bipolari, cellule di sostegno e cellule basali. I prolungamenti distali dei primi due tipi di cellule si presentano particolarmente interessanti: nei recettori olfattivi si rinvengono ciglia e microvilli, numerosi e lunghi; nelle cellule di sostegno robuste digitazioni apicali percorse da uno spesso filamento assile, b) l'assenza, sia nel tentacolo superiore che in quello inferiore, di un complesso neuroendocrino del tipo di quello riscontrato in Helix, Arion ed altri Stilommatofori, c) la presenza nel tentacolo inferiore di una ghiandola unica, tubulare, in comunicazione con l'esterno e con una secrezione di tipo mucoso, simile a quella dei mucociti di altre superfici del corpo, o della ghiandola del piede di questa o di altre specie di molluschi.

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  1. Istituto di Zoologia dell'Università di Siena, Italia

    A. Renzoni

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Renzoni, A. Osservazioni istologiche, istochimiche ed ultrastrutturali sui tentacoli di Vaginulus borellianus (Colosi), Gastropoda Soleolifera. Zeitschrift für Zellforschung 87, 350–376 (1968). https://doi.org/10.1007/BF00333686

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