Olivocerebellar tract

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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
Dorlands/Elsevier	t_15/12817047

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]

[edit] References

[edit] Additional images

Deep dissection of brain-stem. Lateral view.

Deep dissection of cortex and brain-stem.

[edit] 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 As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Brain: rhombencephalon (hindbrain) Metencephalon/ pons Dorsal/ (tegmentum) 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 Ventral/ (base) Middle cerebellar peduncles (Pontocerebellar fibers) - Pontine nuclei motor/descending: Corticospinal tract - Corticobulbar tract - Corticopontine fibers Raphe/reticular Reticular formation (Caudal, Oral, Tegmental, Paramedian) • Raphe nuclei (Median) Myelencephalon/ medulla Dorsal 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 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 Brain and spinal cord: neural tracts and fasciculi Sensory/ascending: PCML Pacinian corpuscle/Meissner's corpuscle → PCML → arcuate fibers (Posterior external arcuate fibers, Internal arcuate fibers) - Medial lemniscus → Thalamus → Postcentral gyrus Sensory/ascending: anterolateral system Free nerve ending → Spinothalamic tract (Lateral, Anterior) → Spinal lemniscus → Postcentral gyrus Spinoreticular tract → Reticular formation Spinotectal tract → Midbrain tectum Motor/descending: pyramidal and extrapyramidal flexion: Primary motor cortex → Posterior limb of internal capsule → Decussation of the pyramids → Corticospinal tract (Lateral, Anterior) → Neuromuscular junction 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 Primary motor cortex → Genu of internal capsule → Corticobulbar tract → brainstem see also white matter fibers

v • d • e Brain: Metencephalon/rhombencephalon - cerebellum (hindbrain) 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) Granule cell layer (Golgi cell, Granule 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