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

在狗和人身上探索控制射精反应的外周交感神经信号。1)我们的结果表明存在两种机制控制盆腔器官；一个是有多条交叉神经支配通路的直接神经支配系统，另一个是由内脏大神经和肾上腺髓质组成的激素系统。2)控制输精管的脊髓节段神经在犬为L1-L4，在人可能为L1-L2，灵长类动物的交感神经通路在骨盆器官的主通路和代偿通路上都有分化。有两个部位（尾侧肠系膜神经丛和前列腺神经丛）腰内脏神经的传出信号穿过另一侧控制双侧精束。4)在交感神经的分化上，灵长类动物的尾侧肠系膜神经丛分为两个神经丛（肠系膜下神经丛和上胃下神经丛）。这种分化在狗身上没有观察到，在猴子身上观察到的不完全，在人类身上观察到的完全，这表明交感神经通路的分化正在进行。

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.