Long‐latency cerebellar responses in cerebellar pedunculi and cortex

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Abstract
Cerebrocerebellar connections indicated by short latency responses were observed in the contralateral lobus anterior, lobulus simplex, tuber vermis, pyramis, lobulus paramedianus, crus I lobuli ansiformis, and lobulus parafloccularis. Responses were present in the homolateral lobulus paramedianus occasionally. The short-latency responses were elicited after stimulation of the anterior sigmoid, posterior sigmoid, anterior lateral, anterior suprasylvian, middle suprasylvian, and middle ectosylvian gyri. No responses were seen after stimulation of the posterior lateral, posterior suprasylvian, posterior ectosylvian, and posterior sylvian gyri. Cerebrocerebellar connections indicated by the long-latency responses were relatively restricted. Action potentials, resulting from stimulation of the cerebral cortex, were present in the contralateral lobus anterior, lobulus simplex, tuber vermis, lobulus paramedianus, and lobulus parafloccularis. Responses were elicited after stimulation of the anterior sigmoid, posterior sigmoid, coronal, middle suprasylvian, and middle ectosylvian gyri. In the results of recording long-latency responses from 3 longitudinally divided zones in the lobus anterior and 2 longitudinally divided zones in the lobulus paramedianus, no strict localization to 1 of these zones could be observed. Somatotopic localization between cerebral and cerebellar somatic receiving areas was not clearly indicated in the lobus anterior and lobulus paramedianus. But, the cerebral auditory area projected to the cerebellar auditory area. Thresholds of cerebral stimulation which evoke the cerebellar responses increased after section of the superior, middle, and inferior cerebellar pedunculi. Cerebellipetal impulses passing through these pedunculi could reach both neo- and paleocerebellum and provide firing of the cerebellar cortical cells. Impulses via middle pedunculi have the strongest influences.