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By means of horseradish peroxidase administration into the wall of the sigmoid colon central part, localization, relative amount, body forms and size of the neurons, dealing with innervation of the given part of the colon have been determined. Labelled neurons are present in the colon wall, in ganglia of the caudal mesenteric artery nervous plexus, in the caudal and cranial mesenteric ganglia in the celiac plexus ganglia, in nodes and internodal branches of the lumbar part of the sympathetic trunk (the left one predominantly) and in the spinal ganglia from TXIII up to LVII. In the grey substance of the spinal cord labelled neurons are not revealed. The main part of the postganglionar sympathetic neurons, projecting their axons to the sigmoid colon, are situated in the caudal mesenteric ganglion. In the spinal ganglia the most part of the labelled neurons are to the left at the level of LII-LVI, to the right--at the level of LII-LV. The optimal time for revealing the greatest number of the labelled neurons are the 1st-3d days after administration of the enzyme. Capture of the lable takes place later in the neurons of those ganglia, which are situated more further from the place of peroxidase administration.