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I. V. I. V. The inferior olivary nucleus is the only source of cerebellar climbing fibers. The Inferior Olive nucleus. Olivary neurons (Ramon Y Cajal). HRP filled olivary neuron. Intracellular labeling of olivary neuron. Action potential in olivary neuron.

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## The inferior olivary nucleus is the only source of cerebellar climbing fibers

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**I**V I V**The inferior olivary nucleus is the only source of**cerebellar climbing fibers**HRP filled olivary neuron**Intracellular labeling of olivary neuron**The effect of Mn2+ and Cd2+ on action potentials in olivary**neuron**-55 mV**-60 mV -60 mV 15 mV -68 mV 1 nA 20 msec Two types of action potentials in olivary neuron -60 mV 15 mV**The Na+ and Ca2+ components of the two types of action**potentials**TTX**Independent activation of the action potentials**10 mV**Refractory period of the action potentials**The Inactivation curve of the low threshold action**potential**Possible mechanism of rhythmic activity**Ionic currents in Olivary neurons: Na current – typical H&H current Dendritic Ca current – high threshold non-inactivating Ca dependent, K current Somatic Ca current – low threshold inactivating**Cell 2**Cell 1 20 mV Cell 1 Cell 2 5 mV 200 ms 20 mV Cell 1 10 mV 2 mV Cell 2 100 ms 200 ms 5 10 mV Electrical coupling between olivary neuron Cell 1 Cell 2

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