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J. Biophys. and Biochem. Cytol., Vol 3, 611-614, Copyright © 1957 by Rockefeller University Press

BRIEF NOTES

Submicroscopic Changes of the Nerve Endings in the Adrenal Medulla after Stimulation of the Splanchnic Nerve

Eduardo De Robertis 1 and Alberto Vaz Ferreira 1

1 (From Departmentos de Ultraestructura Celular y Electrobiología Instituto de Investigación de Ciencias Biológicas, Montevideo, Uruguay.)

The nerve endings of the adrenal medulla of the rabbit were studied under the electron microscope in the normal condition and after prolonged electrical stimulation of the splanchnic nerve. With a stimulus of 100 pulses per second for 10 minutes, there is an increase in the number of synaptic vesicles in the nerve ending. The mean number is of 82.6 vesicles per square micron in the normal and of 132.7 per square micron in the stimulated glands. With a stimulus of 400 pulses per second for 10 minutes, there is a considerable depletion of synaptic vesicles and other changes occur in the nerve endings. The mean number of vesicles is of 29.2 per square micron.

These results are interpreted as indicative of an increased activity of the ending in one case, and as a diminished activity and fatigue of the synaptic junction in the other.

 Submitted on November 19, 1956


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