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[Subpial nerve plexus in the dog spinal cord].

Spinal cord of 10 mature dogs and 5 pups were studied using silver nitrate impregnation and staining after Nissl, Van-Gieson and hematoxylin-eosin. Subpial neuronal layer representing a plexus of non-myelinated and single myelinated nerve fibres and also single neurons and their accumulations was distinguished throughout the whole spinal cord length. Relatively even segmentary distribution of neurons in the subpial plexus was observed in pups. In mature animals neurons of subpial neuronal layer were accumulated predominantly at the level of cervical thickening (3-6 neurons) and less in lumbar thickening (2-4 neurons). In newborns and adult animals maximal neuronal number was found in the subpial layer located on dorsolateral surface of the spinal cord substantiaa alba.