cerebral peduncle


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peduncle

 [pe-dung´k'l]
1. a stemlike connecting part.
2. a collection of nerve fibers connecting between different regions in the central nervous system.
3. the stalk by which a nonsessile tumor is attached to normal tissue. adj., adj pedun´cular.
cerebellar p's three sets of paired bundles (superior, middle, and inferior) connecting the cerebellum to the midbrain, pons, and medulla oblongata, respectively.
cerebral peduncle the anterior half of the midbrain, divisible into a posterior part (tegmentum) and an anterior part (crus cerebri), which are separated by the substantia nigra.
inferior cerebellar peduncle a large bundle of nerve fibers serving to connect the medulla oblongata and spinal cord with the cerebellum (especially the archicerebellum and paleocerebellum); it courses along the lateral border of the fourth ventricle and turns dorsally into the cerebellum. Formerly called caudal cerebellar peduncle.
middle cerebellar peduncle a large bundle of projection fibers originating in the contralateral pontine nuclei and entering the cerebellum, conveying impulses from the cerebral cortex to the neocerebellum.
pineal peduncle habenula (def. 2).
superior cerebellar peduncle a large bundle of projection fibers arising chiefly in the dentate nucleus of each cerebellar hemisphere (neocerebellum) and ascending to decussate in the mesencephalon; its fibers end mostly in the red nucleus and thalamus. Spinocerebellar fibers to the paleocerebellum lie adjacent to each peduncle. Formerly called rostral cerebellar peduncle.
p's of thalamus the four two-way radiations of thalamocortical fibers that connect the dorsal thalamus with many parts of the cerebral cortex, which together form a major portion of the internal capsule and the corona radiata.

ce·re·bral pe·dun·cle

[TA]
originally denoting either of the two halves of the midbrain (a relatively narrow "neck" connecting the forebrain to the hindbrain); this term has been variably used to designate only those large bundles of corticofugal fibers forming the crus cerebri or to designate the crus cerebri plus the midbrain tegmentum; this latter, more inclusive, usage (crus cerebri and midbrain tegmentum) is preferred by some; the substantia nigra, while a part of the base of the peduncle (basis pedunculi), is considered a structure separating the midbrain tegmentum from the crus cerebri.
See also: crus cerebri.
Synonym(s): pedunculus cerebri [TA]

ce·re·bral pe·dun·cle

(ser'ĕ-brăl pĕ-dŭngk'ĕl) [TA]
Large bundles of corticofugal fibers forming the crus cerebri, plus the midbrain tegmentum; the substantia nigra, although a part of the base of the peduncle (basis pedunculi), is considered a structure separating the midbrain tegmentum from the crus cerebri.
See also: crus cerebri
References in periodicals archive ?
Flaherty, "Locked-in syndrome resulting from bilateral cerebral peduncle infarctions," Neurology, vol.
2-5B), it was about 16.38 mm in length and 8.48 mm in width, It extended dorsally between the caudal pole of cerebral hemisphere rostrally and cerebellum caudally, meanwhile ventrally extended between the optic tract and cerebral hemispheres rostrally and the cerebral peduncles and pons caudally.
Diffusion constriction was observed in diffusion weighted series at bilateral dentate nuclei, pons posterior and cerebral peduncles (Figures: 1c and 1d).
CT scan and MRI shows typical signs in form of localised oedema in brainstem, cerebellar white matter, cerebral peduncles, posterior limb of internal capsule, globus pallidus, perirolandic white matter.
The T1-weighted image was used as the anatomical reference to draw regions of interest (ROIs) of bilateral Hc, temporal white matter (TWM), occipital white matter (OWM) and cerebral peduncles (CPs) were measured on the oblique axial APT image, as shown in [Figure 1].
Multiple lesions in the basal ganglia, optic radiation, brain stem and cerebral peduncles are common.
The midbrain, or mesencephalon, is approximately a one half-inch segment lying between the diencephalon and the pons.[12] It is composed of three layers: the tectum, tegmentum and the cerebral peduncles. The tectum is formed by the superior colliculi which is related to the visual system and the inferior colliculi which are part of the auditory system.[23] The crus cerebri and the tegmentum, also known as the cerebral peduncles, are composed of the corticospinal and corticopontine descending motor tracts.
MIDDLE CEREBRAL ARTERY: An axial view of the fetal head was obtained at the level of the cerebral peduncles. Using color Doppler, the middle cerebral artery was identified in the lateral sulcus after its origin from the internal carotid artery.

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