Effect of conditioning stimuli upon evoked potentials in the trigeminal complex.

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Abstract
The characteristics of a centrifugally conducted evoked response recorded in the Gasserian ganglion following infraorbital nerve stimulation were described using cats anesthetised with Chloralose. It was proposed that this evoked reflex response be called the trigeminal dorsal root reflex because its characteristics were found to be similar to those of the spinal cord dorsal root reflex. The effect of conditioning stimuli delivered to sensorimotor cortex, reticular formation, spinal cord dorsal columns, peripheral nerve and optic nerve was such that there followed during limited time intervals a clear reduction of the amplitude of the trigeminal dorsal root reflex and of the evoked response recorded from secondary neurons of nucleus caudalis. Neural activity ascending from spinal levels and descending from the cerebral hemispheres may then influence somatosensory input at the trigeminal primary neuron and at secondary relays in nucleus caudalis. Pathways and mechanisms which may mediate these effects were discussed.

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