Single preganglionic sympathetic neurons of the cat branch intraspinally and project through different rami communicantes albi--a retrograde double labelling study with fluorescent tracers.
Evidence is presented that in lumbar segments of the cat, two neighbouring rami communicantes albi (white rami, WR) may contain axons of one and the same preganglionic sympathetic neurone (PSN). This was shown with bisbenzimide (Bb) and propidium iodide (PI) applied in the same cat to the central cut ends of two WR (PI to WRL1, Bb to WRL2). PSN, double labelled from both these sites, were observed in the intermediolateral and intercalate nuclei of the L1 segment. It is postulated that axons of PSN branch intraspinally and project through different WR.
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D006690:Bisbenzimidazole; D002415:Cats; D008161:Lumbosacral Region / Q000294:innervation*; D008856:Microscopy, Fluorescence; D009474:Neurons / Q000166:cytology*; D011419:Propidium; D013564:Sympathetic Nervous System / Q000166:cytology*
D011419:Propidium; D006690:Bisbenzimidazole