EFFECT OF BULBAR FACILITATION AND INHIBITION ON PERIPHERAL REFLEX INHIBITION

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Abstract
The effects of stimulation of the bulbar facilitatory and inhibitory reticular systems on both reciprocal inhibition and reflex inhibition of the knee-jerk were studied in expts. on cats anesthetized with nembutal. Records were made of actions of the biceps-quadriceps or tibialis anticus-gastrocnemius pairs in response to stimulation of the central ends of the cut ipsilateral or contralateral sensory nerves and of the recurrently elicited knee-jerk as affected by stimulation of the central end of the sectioned ipsilateral hamstring nerve. Simultaneous stimulation of the bulbar facilitatory system enhanced both the excitatory and the inhibitory phases of the reciprocal inhibition responses, whereas the knee-jerk inhibition effect was opposed. Simultaneous stimulation of the bulbar inhibitory system caused abolition of both the excitatory and inhibitory phases of the reciprocal inhibition response but added with the knee-jerk inhibition effect. It was concluded that the bulbar facilitatory and inhibitory system projections into the cord acted at some early synapse in the reflex arc.

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