Summary
This investigation was undertaken to describe the ultrastructure of cardiac ganglia in rabbits from day 18 of gestation to day 35 postpartum. Special attention was directed to the types of synaptic contacts made with the principal neurons and with the small granule-containing cells. The cardiac ganglia in all animals consisted mainly of parasympathetic postganglionic neurons, supporting cells, and small granule-containing (small intensely fluorescent) cells. The neurons received afferent synaptic terminals of two types. One type contained mainly small clear vesicles typical of most cholinergic terminals. The second type contained mainly small dense-core vesicles (these were most prominent after treatment of the animal with 5-hydroxydopamine), and were considered to be adrenergic terminals. These adrenergic terminals are probably part of an inhibitory system in the ganglia. The small granule-containing cells received typical afferent synaptic terminals of the cholinergic type, and also formed specialized contacts with certain axonal terminals. These latter specializations are considered to be reciprocal synapses which probably have a role in modulating ganglionic transmission.
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Supported by the Kentucky Heart Association and the Heart Association of Louisville and Jefferson County
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Papka, R.E. Studies of cardiac ganglia in pre- and postnatal rabbits. Cell Tissue Res. 175, 17–35 (1976). https://doi.org/10.1007/BF00220820
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DOI: https://doi.org/10.1007/BF00220820