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Brain: Inferior cerebellar peduncles
Scheme showing the connections of the several parts of the brain. (Inferior peduncle labeled at bottom right.)
Section of the medulla oblongata at about the middle of the olive. (Inferior peduncle labeled at upper right.
Latin pedunculus cerebellaris inferior
subject #187 775
The upper part of the posterior district of the
medulla oblongata is occupied by the inferior peduncle, a thick rope-like strand situated between the lower part of the fourth ventricle and the roots of the glossopharyngeal and vagus nerves.
Each cerebellar inferior peduncle connects the
medulla spinalis and medulla oblongata with the cerebellum, and comprises the juxtarestiform body and restiform body.
Important fibers running thru the inferior cerebellar peduncle include the
spinocerebellar tract and axons from the inferior olivary nucleus, among others.
The inferior cerebellar peduncle carries many types of input and output fibers that are mainly concerned with integrating
proprioceptive sensory input with motor vestibular functions such as balance and posture maintenance.
Proprioceptive information from the body is carried to the cerebellum via the posterior spinocerebellar tract.
This tract passes through the inferior cerebellar peduncle and synapses within the paleocerebellum.
Vestibular information projects onto the archicerebellum.
This peduncle also carries information directly from the
Purkinje cells to the vestibular nuclei in the dorsal brainstem located at the junction between the pons and medulla.
Additional images Edit
Upper part of medulla spinalis and hind- and mid-brains; posterior aspect, exposed in situ.
Superficial dissection of brain-stem. Lateral view.
Dissection of brain-stem. Lateral view.
Deep dissection of brain-stem. Lateral view.
Dissection of brain-stem. Dorsal view.
Diagram showing the course of the arcuate fibers.
Dissection showing the course of the cerebrospinal fibers.
External links Edit
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 As such, some of the information contained herein may be outdated.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.
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)