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KMID : 0376219850220030431
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Chonnam Medical Journal
1985 Volume.22 No. 3 p.431 ~ p.449
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Ultrastructure of the Cardiac Ganglia in the Heart of the Mongolian Gerbil
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Abstract
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The fine structure of ganglionic cell bodies and the synapses in the cardiac ganglia of control and 5-hydroxydopamine administrated Mongolian gerbils were studied by electron microscope.
The cardiac ganglia of the Mongolian gerbil consisted of small to large clusters of neurons and nerve processes together with satellite cells and blood vessels. The ganglion cells were large and each contained a prominent nucleus with one or more nucleoli. The perikaryon of the ganglion cells contained numerous profiles of rough endoplasmic reticulum, extensive Golgi apparatus and mitochondria. Both the perikaryon and dendrites were covered by processes of the satellite cells. After administration of 5-hydroxydopamine clusters of small granular vesicles were observed near the Golgi apparatus. Core materials within a granular and granular vesicles of adrenergic nerve fibers increased in density, while a granular vesicles in cholinergic nerve fibers did not change. A greater number of synaptic junctions between the cholinergic preganglionic axon terminals and the dendrites of postganglionic neuron were found, and a few axiomatic synapses were also observed. Synaptic contacts between the adrenergic nerve terminals to dendrites of cardiac ganglion were rarely seen.
These finding suggested that the cardiac ganglia serve as a final common pathway, through which at least two kinds of input may simultaneously influence the effector tissue of the heart.
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