Physiology 3120 Lecture Notes - Lateral Vestibular Nucleus, Vestibular Nuclei, Deep Cerebellar Nuclei

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Cerebellum: comes from latin for little brain. Has a cortex, just like the cerebrum (big brain) Also has deep nuclei, which are further inwards from the cortex. 10% of the volume of the brain; said to have more than half the neurons in the brain: cell types in the cerebellum. Give rise to an axon called a parallel fibres that run down to purkinje cells. 3 other cell types in the cerebellar cortex; all are inhibitory interneurons. No change in sensory thresholds and no change in strength of movement. Movements becomes inaccurate & uncoordinated (i. e. ataxic: lesions. Input comes from neurons in the pons; excitatory; collateral from this afferent axon goes to the deep nuclei in an excitatory manner. Connection from purkinje cells to deep nuclei is always inhibitory. Project to fastigial neurons to the lateral (vestibular ocular reflexes) or medial/reticular formation (saccades) vestibular nucleus. Dysmetric (deficit in length of) saccades; overshoot = hypermetria, undershoot =

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