EXCITATORY INPUTS FROM THE CEREBRAL-CORTEX TO THE DENTATE NUCLEUS

Cerebral inputs to the dentate nucleus were examined by recording intr acellular potentials from dentate output neurons in the cat. These neu rons were found to receive excitatory inputs mainly from area 6 via th e contralateral pontine nucleus (PN), nucleus reticularis tegmenti pon tis (NRTP) and inferior olive. Intracellular staining with horseradish peroxidase gave the morphological evidence that some PN and NRTP neur ons gave axon collaterals to the dentate nucleus before terminating in the granular layer of the cerebellar cortex as typical mossy fiber ro settes.