The intermedio-lateral nucleus in the 1--2 lumbar segments of spinal cord was studied in adult cats. Many large presynaptic terminals contained both the filaments and the light synaptic vesicles which were in contact either with neuronal body or with initial portions of dendrites. There were no spines on the dendrites. The nucleus was shown to contain more fibrous astrocytes than other parts of the c. n. s. The data obtained are discussed with regard to the results of recent electrophysiological study of sympathetic preganglionic neurons.
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