Abstract
It has been observed that, in cats under Nembutal anaesthesia, stimulation of the cerebellar and non-specific thalamic nuclei can induce depolarization of the afferents to the cuneate nucleus. This depolarization has been evidenced by: (1) increase in the excitability of the afferent terminals as revealed by Wall's technique; (2) appearance of a negative slow potential in the dorsal columns; (3) field potentials in the nucleus itself. The cerebellar effects, which were maximal after stimulation of n. fastigii, were present even after acute decerebration and were mainly mediated by the inferior cerebellar peduncle. The thalamic effects were still present after ablation of the sensorimotor cortex and of the basal ganglia. The hypothesis advanced is that both thalamic and cerebellar effects are mediated by the bulbopontine reticular formation.
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