john fitzmartin - Academia.edu (original) (raw)
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Centro de Investigacion y Estudios Avanzados del IPN
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Brain Research, 1973
Limited studies have been concerned with evoked central nervous system activity incident to stimu... more Limited studies have been concerned with evoked central nervous system activity incident to stimulation of non-myelinated fibers in peripheral nerve. Spike discharges relating to C fibers have been identified in dorsolateral and propriospinal tracts of cat spinal cord, caudal medulla oblongata, ventral tegmentum of midbrain and ventral nucleus of thalamus4,5,s,14,2L Low amplitude 20-40 c/sec electrocorticographic activity has been identified from cerebral cortex activated by C fiber stimulation 26. Using computer averaging of the integrated spike response recorded from ventral lateral quadrant in spinal cord, activity relating to C fibers has been analyzed as an evoked potentiaPL To our knowledge, there are no previous reports suggesting that these small unmedullated fibers project to the cerebellum. In this study, evoked responses that can be assigned to C fiber activation in peripheral nerve have been identified on intermediate cortex of lobule V in anterior lobe of cat cerebellum.
Experimental Neurology, 1972
Evoked responses of neurons located in the nucleus reticularis gigantocellularis and lateral tegm... more Evoked responses of neurons located in the nucleus reticularis gigantocellularis and lateral tegmental field of the medulla in 30 cats anesthetized with a mixture of 75% nitrous oxide and 25% oxygen were studied following electrical stimulation of peripheral somatosensory nerves. Single, and trains of multiple stimuli were applied above threshold levels for A-beta-delta fiber activity and the responses of 93 units in the nucleus reticularis gigantocellularis and 28 units in the lateral tegmental field were analyzed with respect to latency, duration, frequency, and afterdischarge. The adequate stimulus for altering unit activity was shown to be stimulation above A-beta-delta threshold. Multiple stimuli in the A-beta-delta range produced a more intense and longer response than single stimuli. A somatotopic organization suggesting predominantly contralateral input as well as predominantly upper extremity input was demonstrated but there was bilateral representation of all four extremities in the caudal nucleus gigantocellularis. Stimulation of the peripheral nerves of the four extremities had no effect on the activity of neurons in the adjacent lateral tegmental field.
Brain Research, 1973
Limited studies have been concerned with evoked central nervous system activity incident to stimu... more Limited studies have been concerned with evoked central nervous system activity incident to stimulation of non-myelinated fibers in peripheral nerve. Spike discharges relating to C fibers have been identified in dorsolateral and propriospinal tracts of cat spinal cord, caudal medulla oblongata, ventral tegmentum of midbrain and ventral nucleus of thalamus4,5,s,14,2L Low amplitude 20-40 c/sec electrocorticographic activity has been identified from cerebral cortex activated by C fiber stimulation 26. Using computer averaging of the integrated spike response recorded from ventral lateral quadrant in spinal cord, activity relating to C fibers has been analyzed as an evoked potentiaPL To our knowledge, there are no previous reports suggesting that these small unmedullated fibers project to the cerebellum. In this study, evoked responses that can be assigned to C fiber activation in peripheral nerve have been identified on intermediate cortex of lobule V in anterior lobe of cat cerebellum.
Experimental Neurology, 1972
Evoked responses of neurons located in the nucleus reticularis gigantocellularis and lateral tegm... more Evoked responses of neurons located in the nucleus reticularis gigantocellularis and lateral tegmental field of the medulla in 30 cats anesthetized with a mixture of 75% nitrous oxide and 25% oxygen were studied following electrical stimulation of peripheral somatosensory nerves. Single, and trains of multiple stimuli were applied above threshold levels for A-beta-delta fiber activity and the responses of 93 units in the nucleus reticularis gigantocellularis and 28 units in the lateral tegmental field were analyzed with respect to latency, duration, frequency, and afterdischarge. The adequate stimulus for altering unit activity was shown to be stimulation above A-beta-delta threshold. Multiple stimuli in the A-beta-delta range produced a more intense and longer response than single stimuli. A somatotopic organization suggesting predominantly contralateral input as well as predominantly upper extremity input was demonstrated but there was bilateral representation of all four extremities in the caudal nucleus gigantocellularis. Stimulation of the peripheral nerves of the four extremities had no effect on the activity of neurons in the adjacent lateral tegmental field.