Glossary

cerebellar cortex Formed by three cellular layers—the molecular, Purkinje, and granular layers.

cerebellar deep nuclei Three pairs of nuclei embedded in the cerebellar white matter in which the neurons projecting to extracerebellar structures are located. The vast majority of these neurons are excitatory.

climbing fiber Second largest component of fibers that reach the cerebellum. They are formed by axons of inferior olive cells and terminate on neurons located in the deep nuclei as well as on Purkinje cells.

dismetria Disturbance of the control of range direction and force of muscle contraction determining disruption of coordination of multijoint movements.

mossy fiber The largest group of fibers that reach the cerebellum. They terminate on neurons located in the deep nuclei as well as on granule cells.

Purkinje cell Only efferent cell of the cerebellar cortex. It has an inhibitory effect on the cerebellar deep nuclei.

The cerebellum is a portion of the brain that plays a key role in many aspects of human behavior. This article presents available data on the cellular and physiological organization of the cerebellar circuits, stressing from a multidisciplinary standpoint, the new functions that have been recently added to the traditional cerebellar repertoire of motor learning and motor control.

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