【摘要】 猫腰骶髓背角神经元对同侧颈髓背索和背外侧索的逆向刺激发生反应。这些神经元对刺激背索抑或背外侧索的逆向反应,在C₇-T₄节段的背索和背外侧索被分隔开时消失。其中,以背索刺激引起的逆向反应的消失机率居多。背索刺激的阈强度、不应期和逆向反应潜伏期等参数多高于背外侧索的有关参数。结果提示,脊髓背角脊颈束-背索突触后神经元轴突在下颈上胸节段分叉;分叉后的背外侧索分支的直径多粗于背索分支。更多还原

【Abstract】 Neurons in the lumbosacral dorsal horn were doubly activated by antidromicstimulation of both the ipsilateral dorsal and dorsolateral funiculi in the cervicalspinal cord. One of the antidromic responses of these neurons to dorsal and dorso-lateral funicular stimulation disappeared when dissection between the two funiculireached the segments of C₇-T₄. More chances of disappearance occurred in theresponses to dorsal column stimulation than the responses in the dorsolateral side.Most of the threshold, refractory period, and latency recorded from the dorsal columnside were higher than those in the dorsolateral funiculus. The results indicatethat most of the neurons’ axons bifurcate at the cervico-thoracic junction of thespinal cord and the diameter of most of their dorsolateral branches are larger thanthat of the dosal column branches.更多还原