Afferent Climbing Fiber on Purkinje Neurons

A single Purkinje neuron (blue) is receiving numerous synaptic contacts from a single climbing fiber (red). A nearby basket cell (black) forms a basket of axon terminal branches around the initial segment of the Purkinje axon. A climbing fiber causes one Purkinje cell to fire a burst of action potentials. The basket cell strongly inhibits Purkinje cells.