Essential part of reflex arc for establishment of conditioned reflex. Formation of conditioned reflex after exclusion of motor peripheral end.

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Abstract
The right hind leg of 4 dogs was paralyzed by crushing the anterior nerve roots. Before regeneration of the injured motor nerves, elaboration of a simple conditioned reflex was made on the paralyzed limb, the animal being unable to make the actual movement. After regeneration, all animals displayed conditioned withdrawal of the limb under study to the conditioned stimulus.