ISSN:
0095-9898
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
,
Medicine
Notes:
The sympathetic ganglion of the toad consists of two kinds of neurons, the sB and sC neurons of which axons are the B and C fibers, respectively. The sB neurons receive a monosegmental innervation of preganglionic B fibers whereas the sC neurons receive mono- or multisegmental innervation of preganglionic C fibers. The pre- and postganglionic neurons are divided into a fast (sB neuron) and slow (sC neuron) conduction system. The conduction velocity of the preganglionic axons is proportional to that of the synaptically connected postganglionic neuron axons in the sB and sC neuron systems. In the sB neuron system, the conduction velocity of the preganglionic axons is faster than that of the postganglionic fibers. The relation is reversed in the sC neuron system. The antidromic and orthodromic responses as well as the electrical membrane properties of sC neurons were analyzed and compared with those of the sB neurons. In both neurons, the time constant of the synaptic potential decay was always longer than that of the membrane. The synaptic potentials of sB and sC neurons were abolished at the membrane potential levels of -10 mv and -7 mv on the average, respectively, which indicates that the equilibrium potentials of these neurons are almost the same. The changes in the excitability of the soma as well as axon of the sB and sC neurons after a single response and the response of the sB and sC neurons to a long cathodal current were analyzed and compared.
Additional Material:
13 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jcp.1030660103
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