On climbing fibre projections to cerebellar paramedian lobule activated from mesencephalon in the cat

doi:10.1016/0006-8993(81)90072-X

Brain Research

Volume 211, Issue 1, 27 April 1981, Pages 135-140

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Abstract

Climbing fibre projections to cerebellar paramedian lobule activated from structures in medial midbrain tegmentum were studied in chloralose anaesthetized cats. Three sagittal zones were identified, from medial to lateral c1, c2 and d1 zones. The c1 and d1 zones were activated, at the same short latency, from a dorsal tegmental region with a location similar to the composite bundle called the central tegmental tract. The d1 zone is probably activated via rubro-olivary fibres and the c1 zone via some other fibres in this bundle. The path to the c2 zone seemed to proceed only partly within this dorsal tegmental region. The d1 zone was also activated, at longer latency, from a region ventral to the red nucleus.

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Climbing fibre projections to the C₂ zone of the cerebellar cortex activated from structures in the midbrain were studied by electrophysiological technique in chloralose-anaesthetized cats. The C₂ zone was identified in the paramedian lobule and in the intermediate part of the anterior lobe by peripheral nerve stimulation. Foci in the medial midbrain, which upon low intensity stimulation selectively evoked climbing fibre responses in the C₂ zone, were localized by careful mapping procedures. Histologically the active region was identified as overlying the nucleus of Darkschewitsch, and it was suggested that this nucleus was the origin of a pathway which via the rostral parts of the medical accessory olive projected to the C₂ zone of the posterior as well as the anterior cerebellar cortex.
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Climbing fibre projections to posterior cerebellar vermis (lobule VII) activated from midbrain tegmentum and tectum were studied in chloralose anaesthetized cats. Only a medial, possibly bilateral, region of lobule VII was activated by fibres proceeding in a dorsal tegmental region, located within and dorsally to the red nucleus. The same area of lobule VII was also activated from tectum, in the deeper layers of superior colliculi at slightly longer latency. It was suggested that this represents a tecto-olivocerebellar pathway.
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: This work was supported by the Swedish Medical Research Council (MFR) Project 5675.

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On climbing fibre projections to cerebellar paramedian lobule activated from mesencephalon in the cat

Abstract

Brain Research

Brain Research

Brain Research

Brain Research

Functional significance of connections of the inferior olive

Physiol. Rev.

Spino-olivo-cerebellar pathways to the posterior lobe of the cat cerebellum

Exp. Brain Res.

The olivocerebellar projection in the cat studied with the method of retrograde axonal transport of horseradish peroxidase. VI. The projection onto longitudinal zones of the paramedian lobule

J. comp. Neurol.