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The relation of anti dromic impulses in the dorsal root fibres to the dorsal root potential in the frog



The relation of anti dromic impulses in the dorsal root fibres to the dorsal root potential in the frog



Jour Physiol 142(2): 343-359



Antidromic impulses in dorsal roots of the lumbar enlargement of the frog's spinal cord were observed following afferent stimulation. Frequently a large number of fibers are involved in discharges lasting up to 30 msec and containing bursts of synchronized impulses. A volley on an ipsilateral dorsal root or the dorsal column, or a sharp tap on the skin, all produce the same impulse pattern, termed the dorsal root reflex. Contralateral stimuli facilitate the reflex. Only the lumbar enlargement is necessary for the dorsal root reflex to occur in the lower extremities, and it is found only if the stimulation frequency is less than 1/sec. The height of the dorsal root potential on which an antidromic impulse appeared in a given dorsal root fiber was found to be nearly the same with different types of afferent volley and varied between 0.80 and 1.12 msec. A dorsal root volley reduced the threshold of individual dorsal column fibers to direct stimulation by 40-50%. An externally applied outward membrane current produced repetitive firing in individual dorsal column fibers; a subthreshold current facilitated a dorsal root reflex and vice versa. It is concluded that the impulses of the reflex are probably generated by outward membrane current in the dorsal columns.

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Accession: 025910719

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PMID: 13564441


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