Abstract
Cerebellar folia, when neurologically isolated from other cerebellar tissue, show considerable spontaneous activity and electrical responsiveness. Such chronically isolated folia have Purkinje cell axon collaterals (PAC) which form extensive connections with other cerebellar folia and appear to be the only such folium-to-folium connections which exist. Conduction velocity within the PAC system ranges between 0.5 and 2.5 m/sec and connections are made with Purkinje cell dendrites, Golgi-II cells, granule cells, and basket cells. The PAC system appears to act by inducing short-term inhibition (under 50 msec) upon cells which are contacted. A possible functional role is that this system may exert a fine or “vernier” control while the basket and Golgi-II cells exert a coarse or “block” control on cortical (cerebellar) neurons.
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