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Under study was the ultrastructural organization of chromaffin cells in the nodes of the solar plexus of albino rats. The chromaffin cells form accumulations--paraganglia, bent for capillaries. The chromaffin cells are of small size and have a dense glial capsule. The cytoplasms are rich in mitochondria, Golgi Complexes and vesicles containing catecholamines. The state of cytoplasmic components speaks of asynchronous secretory activity of chromaffin cells. Among catecholamine-containing vesicles three main types can be distinguished, different is size, structure of the content and localization in the perikaryon. Excretion of catecholamines in realized through cytoplasmic processes which, getting free of the glial capsule, come out directly to capillaries. The coordinating influence of the sympathetic nervous system on the endocrinous function of chromaffin paraganglia of the solar plexus is exercised by paraganglionic fibres, whose terminal portions form synaptic contacts on the chromaffin cells.
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