study on mechanisms of the propagated sensation along meridians
jia jun1, zhao yan2,wang huisheng2,et al. (1.department of physiology, capital university of medical sciences, beijing 100054;2.department of neurobiology of medical school, xi‘an jiaotong university )
［abstract］purposeto approach to long distance information transmission between peripheral sensory nerve endings and properties of this information transmission. methods the effects of antidromic electrical stimulation of the spinal nerves on the discharges of the remote mechanoreceptive units in rats were observed by isolating filaments of the dorsal cutanous branches. results the recorded units were mainly aδ - and c-neurons units. the receptive field of the units mainly located within the scope of 0.5-2.0 cm around the middle line of the back. the discharge frequency of mechanoreceptive units increased significantly during 91-120 seconds after the stimulation. similar increasing responses of the discharge were observed when t9 was stimulated to record t12 units,and when t12 was stimulated to record t9 and vice versa. in addition,in the cases of the dissection and the non-dissection of t10 and t11 from the spinal cord, no significant differences were found between the two groups in terms of the property or the discharge increase. conclusion there exists the long distance information transmission between peripheral nerve endings, characterized by a slow conductive velocity, relatively stable transmission routes, and bi-directional transmission independent of central modulation. the long distance transmission forms possibly the physiological basis of the propagated sensation along meridians.
［key words］information transmission across spinal cord segments;isolating nerve filaments; propagated sensation along meridians; peripheral sensory nerve endings