motor cortex


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Related to motor cortex: sensory cortex, supplementary motor cortex

mo·tor cor·tex

the region of the cerebral cortex most nearly immediately influencing movements of the face, neck and trunk, and upper and lower extremities; it corresponds approximately to Brodmann areas 4 and 6 of the precentral gyrus and anterior paracentral gyrus, and immediately adjacent portions of the superior and middle frontal gyri; its effects on the motor neurons innervating the skeletal musculature are mediated by corticospinal fibers (pyramidal tract) and corticonuclear fibers and are particularly essential for the human capacity to perform finely graded movements of the extremities, especially the upper.

mo·tor cor·tex

(mō'tŏr kōr'teks)
The region of the cerebral cortex most immediately influencing movements of the face, neck, trunk, arms, and legs; its effects on the motor neurons innervating the skeletal musculature are mediated by the pyramidal tract.
Synonym(s): excitable area, motor area, Rolando area.

motor cortex

The part of the surface layer of each hemisphere of the main brain (cerebrum) in which voluntary movement is initiated. These areas can be mapped out to show which parts of them are responsible for movement of any particular parts of the body. The map resembles a distorted and inverted human figure.

motor cortex

the part of the cerebral cortex of the brain that controls the motor functions.

Rolando,

Luigi, Italian anatomist, 1773-1831.
fissure of Rolando - a double S-shaped fissure extending obliquely upward and backward on the lateral surface of each cerebral hemisphere at the boundary between frontal and parietal lobes. Synonym(s): central sulcus
rolandic epilepsy - a benign autosomal dominant form of epilepsy occurring in children.
Rolando angle - the angle at which the fissure of Rolando meets with the midplane.
Rolando area - the region of the cerebral cortex most immediately influencing movements of the face, neck and trunk, arm, and leg. Synonym(s): motor cortex
Rolando cells - the nerve cells in Rolando gelatinous substance of the spinal cord.
Rolando column - a slight ridge on either side of the medulla oblongata related to the descending trigeminal tract and nucleus.
Rolando gelatinous substance - the apical part of the posterior horn of the spinal cord's gray matter, composed largely of very small nerve cells. Synonym(s): gelatinous substance
Rolando tubercle - a longitudinal prominence on the dorsolateral surface of the medulla oblongata along the lateral border of the tuberculum cuneatum. Synonym(s): tuberculum cinereum

cortex, motor 

Area of the frontal lobe of the brain just anterior to the central sulcus which is responsible for voluntary movements of the eyes (as well as other voluntary movements of other parts of the body). The motor cortex in each hemisphere controls mainly muscles on the opposite side of the body. It is laid out according to the parts of the body, with the region controlling the feet at the top and the region controlling the legs, the trunk, the arms and the head in descending order.
References in periodicals archive ?
It has been demonstrated in rats and mice that during motor skill learning, reorganization and expansion occurs in the related motor cortex region where movement is represented in the primary motor cortex and an increased complexification and cortical synaptogenesis develop in the dendritic spines of the pyramidal neurons (24).
However, preservation of original mapping was again reduced in non-TMSR patients, showing that the TMSR procedure preserves strong functional connections between primary sensory and motor cortex.
Chronic alcoholic intoxication (CAI) exacerbated the motor deficits induced by motor cortex ischemia in rats.
The direct corticomotoneuronal (CM) pathway connects the motor cortex to spinal motoneurons.
The patients were seated in a comfortable chair, and the coil was positioned at the leg representation in the motor cortex of frontal lobe.
Another study, published this year by Marc Slutzky at Northwestern University, made an attempt to decode signals from the motor cortex as patients read aloud words containing all of the 39 English phonemes (consonant and vowel sounds).
The resting motor threshold (rMT) was determined before each session using single-pulse stimulation over the left primary motor cortex.
In separate experiments, the researchers found that motor cortex neurons that were active when mice ran on a treadmill were also active later during non-REM sleep, which spans several stages of sleep and accounts for about three-quarters of sleep time in people.
For instance, there is an auditory cortex responsible for perceiving sound, a somatosensory cortex responsible for touch perception, a visual cortex responsible for seeing, and a motor cortex responsible for executing voluntary movements.
This picture represents the energy and phase of the component of the EM Field in the computational unit of the motor cortex that is embedded in an environment that is generating this SHO behaviour.
01) and in the primary motor cortex on the side of the infarct (p less than 0.
The pre-motor cortex is located in front of the primary motor cortex and laterally on the surface of the frontal lobe.