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Climbing fibers are the name given to a series of neuronal projections from the inferior olivary nucleus located in the medulla. These axons pass through the pons and enter the cerebellum where they form synapses with the deep cerebellar nuclei and Purkinje cells. Each climbing fiber will form synapses with 1-10 Purkinje cells. Early in development, Purkinje cells are innervated by multiple climbing fibers, but as the cerebellum matures, these inputs gradually become eliminated resulting in a single climbing fiber input per Purkinje cell. These fibers provide very powerful, excitatory input to the cerebellum which results in the generation of complex spikes in Purkinje cells. Climbing fiber activation is thought to serve as a motor error signal sent to the cerebellum, and is an important signal for motor learning. Drawing by Santiago Ramón y Cajal of cells in the pigeon cerebellum. ... In anatomy, the olivary bodies or simply olives (Latin oliva) are a pair of prominent oval structures in the medulla oblongata, the lower portion of the brainstem. ... Medulla can refer to: The medulla oblongata, a part of the brainstem Medulla, Florida, a U.S. city The 2004 music album Medúlla by Icelandic singer Björk. ... An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neurons cell body or soma. ... Position of the pons in the human brain The pons (sometimes pons Varolii after Costanzo Varolio) is a knob on the brain stem. ... Figure 1a: A human brain, with the cerebellum in purple. ... Illustration of the major elements in a prototypical synapse. ... Figure 1a: A human brain, with the cerebellum in purple. ... Drawing of pigeon Purkinje cells (A) by Santiago Ramon y Cajal Purkinje cells are a class of GABAergic neuron located in the cerebellar cortex. ... In neuroscience, an excitatory postsynaptic potential (EPSP) is a temporary decrease in postsynaptic membrane potential caused by the flow of positively-charged ions into the postsynaptic cell. ... Motor learning is the process of improving the smoothness and accuracy of movements. ...
The anatomical unit composed of a particular sagittal zone with its climbingfibers and their collaterals, along with the corresponding Purkinje cells and the associated cerebellar nucleus has been called a module (Voogd and Bigar, 1980), which is considered to be the functional unit of the cerebellum (Andersson and Oscarsson, 1978; Oscarsson, 1969, 1979).
Their contribution to floccular climbingfiber signaling remains to be determined, but some indication of what these inhibitory inputs may be doing is available from recordings in the awake rabbit of floccular complex spike activity during vestibular stimulation in the absence of vision (De Zeeuw et al., submitted).
This connectivity suggests that the climbingfiber input to the C2 zone of the flocculus may carry motor signals that are related to voluntary gaze shifts involving both the head and eyes.
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