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December 1955

Functional Localization in the Cerebellum: Somatotopic Organization in Cortex and Nuclei

Author Affiliations

Philadelphia With the Technical Assistance of Elizabeth Hunter

AMA Arch NeurPsych. 1955;74(6):653-680. doi:10.1001/archneurpsyc.1955.02330180071008

A new concept of the organization of the cerebellum into longitudinal, corticonuclear zones has been formulated (Chambers and Sprague14) on the basis of anatomical studies of Jansen and Brodal* and on our own physiological observations.† This concept stresses the importance of localization in the efferent corticonuclear projections, rather than the distribution of afferent fibers in the cerebellar cortex, in the interpretation of the results obtained by stimulation and ablation. Three bilaterally symmetrical zones have been defined in the cat (Fig. 1): (a) Each medial zone (vermal cortex and fastigial nucleus) regulates the tone, posture, locomotion, and equilibrium of the entire body; (b) each intermediate zone (paravermal cortex and nucleus interpositus) regulates the spatially organized and skilled movements and the tone and posture associated with these movements of the ipsilateral limbs, and (c) each lateral zone (hemispherical cortex and dentate nucleus) is involved in the same skilled and spatially organized

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