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Primary motor cortex

Name: Primary motor cortex
Description: The part of the cerebral cortex that receives projections from the motor thalamus and which projects to motor neurons in the brainstem and spinal cord. The motor cortex corresponds to Brodmann's area 4 (MM). The primary motor cortex, or M1, is located on the precentral gyrus and on the anterior paracentral lobule on the medial surface of the brain. Of the three motor cortex areas, stimulation of the primary motor cortex requires the least amount of electrical current to elicit a movement. http://neuroscience.uth.tmc.edu/s3/chapter03.html
Synonym(s): primary motor area
Abbreviation: M1
Is part of: motor cortex, frontal cortex
Has role: motor system function
Super-category: Regional part of brain
*Id: nlx_143555
Alternate Id(s): UBERON_0001384
Defining criteria: cyto-architecture, connectivity
Organism: mammal
Link to OWL / RDF: Download this content as OWL/RDF
Defining Criteria: cyto-architecture, connectivity
Cyto-architecture defining Criteria: Like all parts of the neocortex, the primary motor cortex is made of six layers. Unlike primary sensory areas, primary motor cortex is agranular cortex; that is, it does not have a cell-packed granular layer (layer 4). Instead, the most distinctive layer of primary motor cortex is its descending output layer (Layer 5), which contains the giant Betz cells. These pyramidal cells and other projection neurons of the primary motor cortex make up ~30% of the fibers in the corticospinal tract. http://neuroscience.uth.tmc.edu/s3/chapter03.html
Topography defining Criteria: Located anterior to the central sulcus, in the pre-central gyrus in humans. The caudal border is sharp and apposed to primary somatosensory cortex in the depths of the central sulcus.
Brain regions that receive axons from this region: spinal cord ventral horn, Thalamus [1]
Overlaps : Brodmann 1909 area 4 human, Precentral gyrus, Area_4_of_cortex_primary_motor_of_PHT00

Dendrites in Primary motor cortex

Neocortex primary motor area pyramidal layer 5 corticopontine-tectal cell are neurons whose dendrites can be found in Primary motor cortex or its parts.

Parts of Primary motor cortex

Inferred outgoing projections for Primary motor cortex

The following brain regions receive axons from Primary motor cortex: Parafascicular nucleus, Red nucleus. The statements about these projections are not made on this page, but rather are made on the pages linked here.


Notes

This page uses this default form:PONS_brain_region

Non structured information for this region can be found https://en.wikipedia.org/wiki/Primary_motor_cortex


Cite error: <ref> tags exist, but no <references/> tag was found

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*Note: Neurolex imports many terms and their ids from existing community ontologies, e.g., the Gene Ontology. Neurolex, however, is a dynamic site and any content beyond the identifier should not be presumed to reflect the content or views of the source ontology. Users should consult with the authoritative source for each ontology for current information.

Facts about Primary motor cortexRDF feed
AbbrevM1  +
CurationStatusuncurated  +
CytoDefiningCriteriaLike all parts of the neocortex, the prima Like all parts of the neocortex, the primary motor cortex is made of six layers. Unlike primary sensory areas, primary motor cortex is agranular cortex; that is, it does not have a cell-packed granular layer (layer 4). Instead, the most distinctive layer of primary motor cortex is its descending output layer (Layer 5), which contains the giant Betz cells. These pyramidal cells and other projection neurons of the primary motor cortex make up ~30% of the fibers in the corticospinal tract. http://neuroscience.uth.tmc.edu/s3/chapter03.html neuroscience.uth.tmc.edu/s3/chapter03.html
DefiningCriteriacyto-architecture, connectivity  +
DefinitionThe part of the cerebral cortex that recei The part of the cerebral cortex that receives projections from the motor thalamus and which projects to motor neurons in the brainstem and spinal cord. The motor cortex corresponds to Brodmann's area 4 (MM). The primary motor cortex, or M1, is located on the precentral gyrus and on the anterior paracentral lobule on the medial surface of the brain. Of the three motor cortex areas, stimulation of the primary motor cortex requires the least amount of electrical current to elicit a movement. http://neuroscience.uth.tmc.edu/s3/chapter03.html neuroscience.uth.tmc.edu/s3/chapter03.html
EfferentProjectionsSpinal cord ventral horn  +, and Thalamus  +
Has default formThis property is a special property in this wiki.PONS brain region  +
Has roleMotor system function  +
Idnlx_143555  +
Is part ofMotor cortex  +, and Frontal cortex  +
LabelPrimary motor cortex  +
ModifiedDate1 September 2014  +
Page has default formThis property is a special property in this wiki.PONS brain region  +
PartiallyOverlapsWithBrodmann 1909 area 4 human  +, Precentral gyrus  +, and Area 4 of cortex primary motor of PHT00  +
SpeciesMammal  +
SuperCategoryRegional part of brain  +
Synonymprimary motor area  +
TomoDefiningCriteriaLocated anterior to the central sulcus, in the pre-central gyrus in humans. The caudal border is sharp and apposed to primary somatosensory cortex in the depths of the central sulcus.
XrefUBERON_0001384  +