tegmentum


Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to tegmentum: tegmentum of midbrain

tegmentum

 [teg-men´tum] (L.)
1. a covering.
2. tegmentum mesencephali. adj., adj tegmen´tal.
tegmentum mesence´phali (tegmentum of mesencephalon) the posterior part of the mesencephalon, formed by continuation of the posterior parts of the cerebral peduncles across the median plane, and extending on each side from the substantia nigra to the level of the mesencephalic aqueduct. Called also tegmentum.

teg·men·tum

, pl.

teg·men·ta

(teg-men'tŭm, -tă),
1. A covering structure.
[L. covering structure, fr. tego, to cover]

tegmentum

/teg·men·tum/ (-tum) pl. tegmen´ta   [L.]
1. a covering.
3. the dorsal part of each cerebral peduncle.

tegmentum of mesencephalon  the dorsal part of the mesencephalon, formed by continuation of the dorsal parts of the cerebral peduncles across the median plane, and extending on each side from the substantia nigra to the level of the mesencephalic aqueduct.

tegmentum

(tĕg-mĕn′təm) Anatomy
n.
1. A covering or integument of an organ or body part.
2. The ventral part of the midbrain.

teg·men′tal (-təl) adj.

teg·men·tum

, pl. tegmenta (teg-men'tŭm, -tă) [TA]
1. A covering structure.
2. [TA]
Synonym(s): mesencephalic tegmentum.
[L. covering structure, fr. tego, to cover]

tegmentum

pl. tegmenta [L.] a covering.

mesencephalic tegmentum
part of the mesencephalon, the midbrain; contains the motor nuclei of the oculomotor and trochlear nerves, the red nucleus and the reticular formation.
References in periodicals archive ?
Leptochiton odhneri (Bergenhayn, 1931), known from the northwestern coast of Africa, the Canary Islands, and Madeira, has a more weakly sculptured tegmentum, with granules that are arranged in quincunx on the head valve, the lateral areas of intermediate valves, and the postmucronal area of the tail valve.
Staging Systems for Dementia With Lewy Bodies Consensus Guidelines for the Braak Six-Stage Schema for Clinical and Pathological Parkinson-Disease-Related Diagnosis of Dementia Pathology With Lewy Bodies Stage Brain region affected Stage Brain region affected 1 Medulla oblongata, Brainstem predominant pontine tegmentum, 2 olfactory bulb, anterior olfactory nucleus 3 Substantia nigra, Limbic transitional 4 nuclear gray areas in midbrain and forebrain 5 Mature neocortex Neocortex 6 Braak Six-Stage Schema for Staging System for Lewy Body Parkinson-Disease-Related Disorders Proposed by Pathology Beach et al.
Excitation of the brain stem pedunculopontine tegmentum cholinergic cells induces wakefulness and REM sleep.
Second, the vacuolation profile essentially overlapped that in mice infected with BSE-C, with slight differences only in the mesencephalic tegmentum area.
Multipotent neural stem cells from the adult tegmentum with dopaminergic potential develop essential properties of functional neurons.
Their findings suggest that a small group of neurons near the base of the brain, in the mesopontine tegmentum, has executive control over the alert status of the entire cerebrum and spinal cord, and can generate loss of pain sensation, postural collapse, and loss of consciousness through specific neural circuitry.
Structures arising from the mesencephalon are the superior and inferior colliculi of the tectum, cerebral peduncles, optic lobes, optic tectum, tegmentum and somatic motor neurons of cranial nerves III and IV.
The plates are composed of calcium carbonate and are composed of three layers, outer or dorsal tegmentum, articulamentum, and ventral hypostracum.
The lesion affected (i) the pontine tegmentum and trigeminal nuclei which are supposed to be involved in the pathogenesis of migraine-like headache (2,3) and generate trigeminal hypaesthesia and (ii) the vestibular nuclei and the MCP causing contraversive vertigo and nystagmus, ipsiversive body lateropulsion, nausea and vomiting.
Topics on the spinal cord and hindbrain include the segmental organization of the head, brain and cranial nerves, the reticular formation, and the cerebellum, with examinations of the motor and sensory nerves of the cranial brainstorm, those describing the midbrain include descriptions of the tegmentum, tori and optic tectum.
Histaminergic descending inputs to the mesopontine tegmentum and their role in the control of cortical activation and wakefulness in the cat.
Regional cerebral blood flow in fibromyalgia: Single-photon-emission computed tomography evidence of reduction in the pontine tegmentum and thalami.