ELECTRO-ANATOMICAL STUDY OF CEREBELLAR LOCALIZATION. STIMULATION OF VARIOUS AFFERENTS

Abstract

In curarized decerebrate cats unilateral stimulation of various dorsal roots or peripheral nerves produced action potentials in lobulus simplex, culmen, and centralis which were bilateral and showed no significant localization into fore- and hindlimb areas. Responses were not found in Crus I, Crus II, folium vermis, tuber vermis or pyramis under most circumstances. Smaller and less constant responses were obtained in paramedian lobules. Localization of fore- and hindlimb cerebellar areas was observed in curarized decerebrate cats to which Nembutal was administered either with or without curare. By altering the depth of Nembutal anesthesia, transitory states of localization and nonlocalization could be reversibly produced. Corticocortical tracts were ruled out since destruction of the forelimb areas of the anterior lobe and paramedian lobules did not affect the bilateral unlocalized projection to the remainder of the anterior lobe in the decerebrate cats without Nembutal.