title: [Ultrastructure of small granular cells in cardiac ganglia].
abstract: Ultrastructure of small granular cells (SG cells) has been studied in intramural ganglia of the white rat and guinea-pig hearts. No ultrastructural organizational differences have been revealed in SG-cells of these two species. Large granular vesicles in SG-cell cytoplasm make their peculiar sign, three main types among them differing by their form and structure can be mentioned. In SG-cells of the first type, round vesicles 100 nm in the diameter with a central electronopaque core predominate. In SG-cells of the second type, oval vesicles 100--200 nm in the diameter with an eccentric core occur more often. In both cell types, a small amount of round vesicles filled with electronopaque material of moderate density is present. A glomerule consisting of intertangled filaments with large granular vesicles and single mitochondria is described for the first time. Its diameter is about 2 mkm, its preferable position--near the nucleus. On the SG-cell bodies and processes there are synapses formed by terminals with small light vesicles. SG-cell processes form synaptic contacts on neuronal processes.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus / Q000648:ultrastructure; D003599:Cytoskeleton / Q000648:ultrastructure; D005724:Ganglia / Q000166:cytology* / Q000648:ultrastructure; D006168:Guinea Pigs; D006321:Heart / Q000294:innervation*; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure; D008928:Mitochondria / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D051381:Rats; D013569:Synapses / Q000648:ultrastructure
vernacular_title: Ul'trastruktura malykh granuliarnykh kletok v gangliiakh serdtsa.