Primary Motor Cortex

The primary motor cortex is a brain region that in humans is located in the posterior portion of the frontal lobe. It works in association with other motor areas including premotor cortex, the supplementary motor area, posterior parietal cortex, and several subcortical brain regions, to plan and execute movements. Primary motor cortex is defined anatomically as the region of cortex that contains large neurons known as Betz cells. Betz cells, along with other cortical neurons, send long axons down the spinal cord to synapse onto the interneuron circuitry of the spinal cord and also directly onto the alpha motor neurons in the spinal cord which connect to the muscles. The primary motor cortex contains a rough map of the body, with different body parts controlled by partially overlapping regions of cortex arranged from the toe (at the top of the cerebral hemisphere) to mouth (at the bottom) along a fold in the cortex called the central sulcus. Each cerebral hemisphere contains a map that controls mainly the opposite side of the body.

For the discovery of the primary motor cortex and its relationship to other motor cortical areas, see the main article on the motor cortex.

Read more about Primary Motor CortexLocation, Homunculus: The "little Person", Alternative Maps, Common Misconceptions, Pathway, Blood Supply, Neural Input From The Thalamus, Pathology

Other articles related to "primary motor cortex, cortex, motor, primary":

Motor Strip - Common Misconceptions - Betz Cells As The Final Common Pathway
... The Betz cells, or giant pyramidal cells in the primary motor cortex, are sometimes mistaken to be the only or main output from the cortex to the spinal cord ... about 2-3% of the neurons that project from the cortex to the spinal cord, and only about 10% of the neurons that project specifically from the primary motor cortex to the spinal ... A range of cortical areas including the premotor cortex, the supplementary motor area, and even the primary somatosensory cortex, project to the spinal cord ...
Motor Strip - Location
... The human primary motor cortex is located on the anterior wall of the central sulcus ... Anteriorly, the primary motor cortex is bordered by a set of areas that lie on the precentral gyrus and that are generally considered to compose the lateral premotor cortex ... Posteriorly, the primary motor cortex is bordered by the primary somatosensory cortex, which lies on the posterior wall of the central sulcus ...
Motor Strip
... The primary motor cortex is a brain region that in humans is located in the posterior portion of the frontal lobe ... It works in association with other motor areas including premotor cortex, the supplementary motor area, posterior parietal cortex, and several subcortical brain regions, to plan and execute movements ... Primary motor cortex is defined anatomically as the region of cortex that contains large neurons known as Betz cells ...
Primary Motor Cortex - Pathology
... Lesions of the precentral gyrus result in paralysis of the contralateral side of the body (facial palsy, arm-/leg monoparesis, hemiparesis) - see upper motor neuron. ...

Famous quotes containing the words primary and/or motor:

    Parental attitudes have greater correlation with pupil achievement than material home circumstances or variations in school and classroom organization, instructional materials, and particular teaching practices.
    —Children and Their Primary Schools, vol. 1, ch. 3, Central Advisory Council for Education, London (1967)

    This biplane is the shape of human flight.
    Its name might better be First Motor Kite.
    Robert Frost (1874–1963)