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In situ demonstration of changes in the preoptico-neurohypophysical complex after electrical stimulation of the olfactory tract in the catfish Clarias batrachus (Linn.)

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Summary

Electrical stimulation (five minutes) of the olfactory tract in Clarias batrachus results in total degranulation of the neurons of the pars magnocellularis (PMC), while a ten-minute treatment is required for degranulation of the entire nucleus preopticus (NPO). The preoptico-neurohypophysial tract (PNT) and neurohypophysis (NH) of these animals are feebly stained. By 15 minutes of stimulation the neurosecretory material (NSM) is depleted from the entire system; only a few granules may be present in the PNT and NH. A delay for 30 minutes after a 15-minute stimulation causes restoration of NSM in the NH and PNT, while a 60-minute delay results in a higher degree of accumulation of NSM.

Zusammenfassung

Eine 5 min dauernde elektrische Stimulierung des Tractus olfactorius von Clarias batrachus bewirkt eine vollständige Entgranulierung der sekretorischen Neurone der Pars magnocellularis nuclei praeoptici (PMC), während für die Entgranulierung des ganzen Nucleus praeopticus (NPO) eine Stimulierungsdauer von 10 min erforderlich ist. Die Neurosekretfärbung des Tractus praeoptico-neurohypophyseus (PNT) und der Neurohypophyse (NH) fällt bei diesen Versuchstieren mäßig aus. Nach 15 minütiger Stimulierung ist das färbbare Material (NSM) im ganzen neurosekretorischen System weitgehend abgebaut; nur noch wenige Granula finden sich im PNT und in der NH. Eine Ruhephase von 30 min, die auf eine 15 minütige Stimulierung folgt, führt zum Wiederauftreten des NSM in der NH und im PNT, während nach einer 60 minütigen Pause die Menge des NSM weiter zunimmt.

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Prasada Rao, P.D., Dabhade, K.B. In situ demonstration of changes in the preoptico-neurohypophysical complex after electrical stimulation of the olfactory tract in the catfish Clarias batrachus (Linn.). Z. Zellforsch 139, 95–99 (1973). https://doi.org/10.1007/BF00307464

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  • DOI: https://doi.org/10.1007/BF00307464

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