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Parallel activation of dynamic fusimotor neurones and a climbing fibre system from the cat brain stem. II. Effects from the inferior olivary region.

Climbing fibre activity in the cerebellar paramedian lobule and hind limb dynamic fusimotor activation, caused by electrical stimulation in the medial parts of the medulla, were studied in halothane anesthetized cats. Three regions influencing dynamic fusimotor neurones were found. From one of these, corresponding to the nucleus reticularis gigantocellularis, descending activity proceeded in the contralateral ventrolateral funiculus. From the other two, corresponding to parts of the inferior olive and the pyramid respectively, the spinal pathways were located in the contralateral dorsolateral funiculus. The pathway from the olivary region seemed to be identical to a previously described dynamic facilitatory pathway activated in the rubral region. Climbing fibre activity in a hind limb zone of the paramedian lobule was evoked with short latency from caudal parts of the principal olive, but, probably transsynaptically, also from wider areas within the inferior olive. On stimulation in the red nucleus orthodromic responses were found in one region overlapping the nucleus reticularis gigantocellularis, and in another one, situated in the caudal parts of the principal olive. In this latter region, postsynaptic activity was recorded also from the DLF-SOCP. Evidence for a convergence between this pathway and the one from the rubral region was obtained.