[Olivocerebellar, corticonuclear and nucleocortical projections in the "four limbs area" of the paramedian lobule in the cat: a combined electrophysiological and HRP study].
The present study examined the olivocerebellar, corticonuclear and nucleocortical projections in the medial and lateral parts of the "four limbs area" of the paramedian lobule in the cat. Each part of the area could be identified electrophysiologically on the basis of their climbing fiber input. A small volume of 20% horseradish peroxidase (HRP) was injected iontophoretically into the center of an identified area. Results obtained are as follows: 1) Labeled cells were found in the rostral one-third of the medial accessory olive (MAO) of the inferior olive following injections of HRP in the four limbs area of the paramedian lobule. 2) The central MAO projects to the medial and lateral parts of the four limbs area in the caudal folium of the rostral part of the paramedian lobule. 3) The lateral and central MAO project to the medial part of the four limbs area in the intermediate part of the paramedian lobule, and the medial and central MAO project to the lateral part of the four limbs area in the intermediate part of the paramedian lobule. 4) The posteromedial three-fifths of the ipsilateral nucleus interpositus posterior (NIP) receive the corticonuclear projections from the four limbs area. 5) The medial two-fifths of the ipsilateral NIP project to the four limbs area. No strict point-to-point reciprocal relationship was found between corticonuclear and nucleocortical projections.
Inui
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Department of Childhood Education, Aichi Prefectural University, Nagoya, Japan.
D000818:Animals; D002415:Cats; D002525:Cerebellar Cortex / Q000033:anatomy & histology* / Q000502:physiology; D002529:Cerebellar Nuclei / Q000033:anatomy & histology* / Q000502:physiology; D004594:Electrophysiology; D005121:Extremities / Q000294:innervation / Q000502:physiology*; D006735:Horseradish Peroxidase; D009068:Movement; D009847:Olivary Nucleus / Q000033:anatomy & histology* / Q000502:physiology
D006735:Horseradish Peroxidase