The organisation of the projection from the principal lateral reticular nucleus (LRN) to the electrophysiologically defined cerebellar cortical c 1 and c 2 zones within apical folia of the forelimb-receiving area of the rostral paramedian lobule was investigated in cats. In individual experiments, s
The pontine projection onto longitudinal zones of the paramedian lobule in the cat
โ Scribed by G. H. Hoddevik; F. Walberg
- Publisher
- Springer-Verlag
- Year
- 1979
- Tongue
- English
- Weight
- 624 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0014-4819
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โฆ Synopsis
The distribution of labeled cells in the pontine nuclei was studied following microinjections of horseradish peroxidase into three longitudinal zones in the paramedian lobule in the cat. Labeled cells were only found when the staining of the cerebellar cortex included the granular layer. The labeled cells were present contralateral to the injection site in the cases with the smallest injections, in the others there was a bilateral distribution with a contralateral preponderance. The labeled cells lie concentrated in three groups medially, ventrally, and laterally to the peduncle. No indication of a different projection from these three groups to the three longitudinal paramedian zones was found, although in the same material a zonal projection exists for the climbing fibers from various parts of the inferior olive to the same cerebellar lobule (Brodal and Walberg, 1977).
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Following removal of a significant part of the dentate nucleus and most of the interpositus nucleus in the rat cerebellum degenerated cerebellopontine fibres are shown to end in three fairly restricted regions in the contralateral pontine gray: in the paramedian position, in the middle and in the la
The climbing fibre projection to the paramedian lobule (lobule VII) and the copula pyramidis (lobule VIII) in the posterior lobe of the rat cerebellum was investigated in pentobarbitone-anaesthetised animals. Percutaneous electrical stimulation generated climbing fibre field potentials on the cerebe
Extracellular records were taken from the areas 17, 18 and 19 of anaesthetized and immobilized cats. Of the 350 cells recorded in the cortical layers IV-VI, 22 responded with an antidromic action potential to electrical stimulation of the basal pontine region. Antidromic latencies ranged between 1.5