By means of silver nitrate impregnation and luminescent method adrenergic nervous plexuses in spinal cord of 7 people, 6 dogs, 4 cows and 7 rabbits was studied. 17 serial slices of human and rabbit embryos were also examined. Numerous branching and brightly luminescent adrenergic nerve endings were discovered in composition of nervous plexus of spinal cord subpial layer in man and in animals. They should be thought of as sympathetic endings exerting adaptational and trophic influence on adjacent structures and partly penetrating substantia alba of the spinal cord. These observations broaden the existing conceptions on receptory and effectory neuronal processes on the spinal cord surface.
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