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KMID : 0376219830200020327
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Chonnam Medical Journal
1983 Volume.20 No. 2 p.327 ~ p.344
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The Ultrastructure of the Superior Cervical Ganglion of the Suncus Murinus
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Abstract
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The structure of the preganglionic nerve fibers and the ganglionic cell processes and the synapses in the superior cervical ganglion of nontreated control and 5hydroxydopamine-administrated Suncus murinus were studied by electron microscopy.
In the perikaryon of the ganglionic cells were abundant mitochondria, rough endoplasmic reticulum, free ribosome, well-developed Golgi apparatuses, dense bodies; coated vesicles, and neurofilaments. The structural pattern of the ganglionic cell processes was characterized by a tight packing of neurofilaments. Other structural components were mitochondria, ribosome, and vesicles. Two types of axon terminals were differentiated by their vesicular inclusion after 5-hydroxydopamine treatment. One type contained small a granular vesicles which were identified as preganglionic cholinergic axon terminal. The other type contained a majority of small granular vesicles which were classified as adrenergic. Large granular vesicles were observed in both types of axon terminals.
The adrenergic nerve fibers, however, were observed few in number. A great number of synaptic contacts between the cholinergic axon terminals and the dendrites were found, and a few axosomatic synapses were also observed.
The adrenergic axon terminal were found in close proximity to the perikaryon of ganglionic cells. In the vicinity of blood vessel the adrenergic nerve fibers were also observed. This study had shown that the adrenergic fibers were the axons and dendrites of the postganglionic neuron.
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