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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.
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
These Climbing fibres carry information to various sources such as the
spinal cord, vestibular system, red nucleus, superior colliculus, reticular formation and sensory and motor cortices.
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Brain: rhombencephalon (hindbrain)
surface: Locus ceruleus
Trigeminal lemniscus ( Dorsal trigeminal tract, Ventral trigeminal tract)
cranial nuclei: GSA: Principal V/ Spinal V - VIII-c ( Dorsal, Anterior)/ VIII-v ( Lateral, Superior, Medial, Inferior) - SVE: Motor V - VII - GSE: VI - GVE: VII: Superior salivary nucleus
MLF, III, IV and VI ( vestibulo-oculomotor fibers, medial vestibulospinal tract)
sensory/ascending: Trapezoid body/VIII - Superior olivary nucleus
Inferior cerebellar peduncle ( Vestibulocerebellar tract)
motor/descending: Apneustic center • Pneumotaxic center ( Medial parabrachial nucleus) - Lateral parabrachial nucleus
Middle cerebellar peduncles ( Pontocerebellar fibers) - Pontine nuclei motor/descending: Corticospinal tract - Corticobulbar tract - Corticopontine fibers
Reticular formation ( Caudal, Oral, Tegmental, Paramedian) • Raphe nuclei ( Median)
surface: Posterior median sulcus - Postero-lateral sulcus - Area postrema
cranial nuclei: GVA: VII,IX,X: Solitary/ tract • SVA: Gustatory nucleus • GSE: XII • GVE: IX,X,XI: Ambiguus • SVE: X: Dorsal • IX: Inferior salivatory nucleus - MLF, III, IV and VI
sensory/ascending: Gracile nucleus • Cuneate nucleus ( Accessory cuneate nucleus) • Sensory decussation • Medial lemniscus
motor/descending: Dorsal respiratory group
motor/descending: Ventral respiratory group - Pyramid ( Motor decussation) - Inferior olivary nucleus ( Olivocerebellar tract, Rubro-olivary tract) surface: Anterior median fissure - Antero-lateral sulcus - Arcuate nucleus of medulla - Olivary body
Reticular formation ( Gigantocellular, Parvocellular, Ventral, Lateral, Paramedian) • Raphe nuclei ( Obscurus, Magnus, Pallidus)