The path starts from the olivainferior complex on one medulla oblongata half (right or left), crosses over to the opposite side and enters the cerebellum through the lower cerebellar arm.
The parts of the pathway that originate from the main nucleus of the complex (nucleus olivaris inferior) end in the cerebrocerebellum and nucleus dentatus.
The parts of the pathway starting from the posterior and internal accessory olive nucleus end in the spinocerebellum and nucleus interpositus.
The olivo-cerebellar branches that reach into the cerebellar cortex are called climbing threads. These activate a limited amount (max 10 pcs.) Purkinje cells that respond with complex spikes.
(Often the entire amount of olivo-cerebellar threads is called climbing threads.)