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Electrophysiological studies on bifurcation sites of the dual projection neurons from the cat spinal dorsal horn

Lu Guowei, He Guorui, Li Qingjin, Zhang Su, Xia Yu

Department of Xeurophysiology, Beijing Second Medical College. Beijing, China

Abstract

Neurons in the lumbosacral dorsal horn were doubly activated by antidromic stimulation of both the ipsilateral dorsal and dorsolateral funiculi in the cervical spinal cord. One of the antidromic responses of these neurons to dorsal and dorsolateral funicular stimulation disappeared when dissection between the two funiculi reached the segments of C_(7)-T_(4). More chances of disappearance occurred in the responses to dorsal column stimulation than the responses in the dorsolateral side. Most of the threshold, refractory period, and latency recorded from the dorsal column side were higher than those in the dorsolateral funiculus. The results indicate that most of the neurons' axons bifurcate at the cervico-thoracic junction of the spinal cord and the diameter of most of their dorsolateral branches are larger than that of the dosal column branches.

Key words: Spinal dual projection neurons;Antidromic stimulation;Dorsal and dorsolateral fuaicular dissection;Bifurcation point;Axonal diameter

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Citing This Article：

Lu Guowei, He Guorui, Li Qingjin, Zhang Su, Xia Yu. Electrophysiological studies on bifurcation sites of the dual projection neurons from the cat spinal dorsal horn. Acta Physiol Sin 1986; 38 (3): (in Chinese with English abstract).