Olivocerebellar tract: Definition from Answers.com

Brain: Olivocerebellar tract

Transverse section of medulla oblongata below the middle of the olive. (Cerebello-olivary fibers visible at center right.)
Latin	t. olivocerebellaris
NeuroNames	hier-801
NeuroLex ID	birnlex_1579

The olivocerebellar tract (olivocerebellar fibers) leaves the olivary nucleus and pass out through the hilum and decussate with those from the opposite olive in the raphé, then as internal arcuate fibers they pass partly through and partly around the opposite olive and enter the inferior peduncle to be distributed to the cerebellar hemisphere of the opposite side from which they arise.

They terminate directly on Purkinje cells as the climbing fiber input system.^[1]

References

^ Eccles J.C, Llinas R, and Sasaki. Excitation of cerebellar Purkinje cells by the climbing fibers. Nature 203: 245-246, 1964

Additional images

Deep dissection of brain-stem. Lateral view.

Deep dissection of cortex and brain-stem.

External links

Neuroanatomy at UW cere/text/p3/olivo.htm

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.

This neuroscience article is a stub. You can help Wikipedia by expanding it.

Human brain: rhombencephalon, myelencephalon: medulla (TA A14.1.04, GA 9.767)

Dorsal

Surface	Posterior median sulcus · Posterolateral sulcus · Area postrema

Cranial nuclei	afferent: GVA: VII,IX,X: Solitary/tract · SVA: Gustatory nucleus efferent: 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 · Inferior cerebellar peduncle (Juxtarestiform body)

Motor/descending	Dorsal respiratory group

Ventral

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

Raphe/
reticular

Reticular formation (Gigantocellular, Parvocellular, Ventral, Lateral, Paramedian) · Raphe nuclei (Obscurus, Magnus, Pallidus)

v • d • e Human brain, rhombencephalon, metencephalon: cerebellum (TA 14.1.07, GA 9.788)

Regions	Posterior lobe (Horizontal fissure) · Anterior lobe · Flocculonodular lobe (Flocculus, Nodule) Vermis: posterior (Folium, Tuber, Uvula) · anterior (Central lobule, Culmen, Lingula) Hemisphere: posterior (Biventer lobule, Cerebellar tonsil) · anterior (Alar central lobule) white: Arbor vitae Vallecula of cerebellum · Primary fissure

Layers	Molecular layer (Stellate cell, Basket cell) Purkinje cell layer (Purkinje cell, Bergmann glia cell = Golgi epithelial cell) Granule cell layer (Golgi cell, Granule cell, Unipolar brush cell) Fibers: Mossy fibers · Climbing fiber · Parallel fiber

Deep cerebellar nuclei	Dentate · interposed (Emboliform, Globose) · Fastigial

Peduncles	Inferior (medulla): Dorsal spinocerebellar tract · Olivocerebellar tract · Cuneocerebellar tract · Juxtarestiform body (Vestibulocerebellar tract) Middle (pons): Pontocerebellar fibers Superior (midbrain): Ventral spinocerebellar tract · Dentatothalamic tract · Trigeminocerebellar fibers

Brain and spinal cord: neural tracts and fasciculi

Sensory/ascending

PCML	1°: Pacinian corpuscle/Meissner's corpuscle → Gracile fasciculus/Cuneate fasciculus → Gracile nucleus/Cuneate nucleus 2°: → sensory decussation/arcuate fibers (Posterior external arcuate fibers, Internal arcuate fibers) → Medial lemniscus/Trigeminal lemniscus → Thalamus (VPL, VPM) 3°: → Posterior limb of internal capsule → Postcentral gyrus

Anterolateral	Free nerve ending → Spinothalamic tract (Lateral, Anterior) → Spinal lemniscus → Postcentral gyrus Spinoreticular tract → Reticular formation Spinotectal tract → Midbrain tectum

Motor/descending

Pyramidal	flexion: Primary motor cortex → Posterior limb of internal capsule → Decussation of the pyramids → Corticospinal tract (Lateral, Anterior) → Neuromuscular junction

Extrapyramidal	flexion: Primary motor cortex → Genu of internal capsule → Corticobulbar tract → brainstem → muscles of the face, head and neck flexion: Red nucleus → Rubrospinal tract extension: Vestibulocerebellum → Vestibular nuclei → Vestibulospinal tract extension: Vestibulocerebellum → Reticular formation → Reticulospinal tract Midbrain tectum → Tectospinal tract → muscles of neck

Bidirectional:
Spinocerebellar

Unconscious proprioception: Golgi tendon organ → Spinocerebellar (Dorsal/Dorsal nucleus of Clarke/Column of Clarke, Cuneocerebellar) → Cerebellum
Reflex arc: Ventral - Rostral

Brain only

Medial longitudinal fasciculus

Vestibular nucleus → Vestibulocerebellar tract → Cerebellum

Pontine nuclei → Pontocerebellar fibers → Deep cerebellar nuclei

Inferior olivary nucleus → Olivocerebellar tract → Cerebellar hemisphere

	Can urinary tract infection cause upper urinary tract? Read answer...
	Is it true that the pyramidal tract is the major descending voluntary motor tract? Read answer...
	What kind of nerves are in the upward tract and downward tract of the spinal cord? Read answer...

	What is the pyramidal tract?
	Tract in a sentence?
	What is a tract of land?

		Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more
		Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Olivocerebellar tract". Read more