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Abstract
In decerebrate cats, repetitive stimulation of the VIIIth cranial nerve elicits two effects in the lumbar cord which have the same time course. They are: facilitation of the ipsilateral extensor monosynaptic reflex and dorsal root potential. The dorsal root potential is due to primary afferent depolarization in the group I afferents from both extensor and flexor muscles of the ipsilateral hindlimb as well as in cutaneous afferents. The administration of physostigmine results in the VIIIth nerve-produced facilitation of the gastrocnemius-soleus monosynaptic reflex being markedly reduced or reversed to inhibition. Similarly, the dorsal root potential recorded from L 6 is reduced in amplitude. Both of these effects of physostigmine are reversed by atropine.
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