MORPHOLOGICAL AND NEUROPHYSIOLOGICAL STUDY FOR SEMINAL TRANSPORATION

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1) Retrograde ejaculation after bilateral hypogastric nerve transections in the dog is attributable to the absence of effective compensatory sympathetic pathway for bladder neck closure under the recovery of seminal emission by compensatory pathways through spermatic nerves and pelvic nerve.2) Seminal emission and bladder neck closure during ejaculation are generated by 3-5 lumbar splanchnic nerves regardless of their branching levels from lumbar sympathetic ganglia, but not by either intermesenteric splanchnic nerves.3) 3-5 lumbar splanchnic nerves generate bilateral seminal emissions from ejaculatory ducts by sending signals to bilateral epididymal tails and that some of the signals through each lumbar splanchnic nerve cross to the other side at the inferior mesenteric plexus and/or the prostatic plexus.