THE ELECTRICAL ACTIVITIES OF SYMPATHETIC B AND C NEURONS AND THE MODE OF PRESYNAPTIC INNERVATION

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概要

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• The electrical membrane characteristics and activity of an amphibian sympathetic neuron and the mode of its synaptic transmission studied with intracellular microelectrodes have previously been reported by Nishi and Koketsu (1960). Further analysis has been carried out on the neurons of the lumbar sympathetic ganglion of toads. The present paper deals with the electrical responses of two different sympathetic neurons, one of which protrudes a B fiber as its axon (sB neuron) and the other a C fiber (sC neuron), and the mode of the presynaptic innervations of these two neurons. The authors found that the electrical responses of the two neurons are characteristically different from each other, especially in the configurations of their after-potentials, and in the manner of the separation of their antidromic responses under the hyperpolarization of the soma membranes. The modes of presynaptic innervations of these two neurons were also found to be very specific the two postganglionic elements receive innervation independently from the preganglionic neurons of the same types, and no interconnection was found between the pre- and post-ganglionic neurons of the different types. Such an innervation pattern is characteristically different from that of the mammalian sympathetic nervous system. In this system it has long been known that the postganglionic elements are innervated exclusively by the medullated preganglionic elements; the B fibers.

• 久留米大学医学部 The Kurume Medical Journal 編集部の論文

著者

• Soeda Hiroyuki

  Department Of Oral Physiology Fukuoka Dental College

• Nishi S.

  Department of Mechanical Engineering, School of Engineering the University of Tokyo

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