MORPHOLOGICAL AND NEUROPHYSIOLOGICAL STUDY FOR SYMPATHETIC EFFERRENT PATHWAY OF THE CONTROLLING ABDOMINO-PELVIC ORGANS

在狗和人身上探索了控制射精反应的外周交感神经信号。1)我们的结果表明，控制盆腔器官的机制有两种；2)支配输精管的脊髓节段在狗为L1-L4，人为L1-L2，交感神经的分化是在主干和代偿通路上进行的。3)在交感神经的分化过程中，有两个部位(尾侧肠系膜神经丛和前列腺丛)从腰内脏神经传出信号交叉到另一侧以控制双侧输精管。在灵长类动物中，尾侧肠系膜神经丛分为两个神经丛：肠系膜下神经丛和腹下上神经丛。在狗身上没有观察到这种分化，在猴子身上观察到的不完全，在人类身上完全观察到，这表明交感神经通路正在发生分化。

Peripheral sympathetic signals controlling ejaculatory reactions were explored in the dog and man.1) Our results indicate the presence of two kinds of mechanisms controlling the pelvic organs ; one is the direct nerve-innervating system to the seminal tract with multiple cross-innervation pathways and the other the hormonal system consisting of the greater splanchnic nerve and adrenal medulla.2) The spinal cord segments nerve-controlling the vas deferens are L1-L4 in the dog and probably L1-L2 in humans and that differentiation of the sympathetic nerve pathways is proceeding at both main and compensatory pathways to the pelvic organs in the primate.3) There are two sites (caudal mesenteric plexus and prostatic plexus ) where efferent signals from a lumbar splanchnic nerve cross to the other side to control bilateral seminal tracts.4) In the differentiation of the sympathetic nerve, the caudal mesenteric plexus was divided into two plexuses (inferior mesenteric plexus and superior hypogastric plexus) in the primates. This division is not observed in the dog and observed incompletely in monkeys and completely in humans, which suggests a progressing differentiation of the sympathetic pathway.