EditFrom NeuroLex
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 |
| Is part of: | motor cortex, frontal cortex |
| Has role: | motor system function |
| Abbreviation: | M1 |
| Super-category: | Regional part of brain |
| Id: | nlx_143555 |
| 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
Cite error:
<ref> tags exist, but no <references/> tag was found
Facts about Primary motor cortexRDF feed
| Abbrev | M1 + |
| CurationStatus | uncurated + |
| CytoDefiningCriteria | Like 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 |
| DefiningCriteria | cyto-architecture, connectivity + |
| Definition | The 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 |
| EfferentProjections | Spinal cord ventral horn +, and Thalamus + |
| Has default formThis property is a special property in this wiki. | PONS brain region + |
| Has role | Motor system function + |
| Id | nlx_143555 + |
| Is part of | Motor cortex +, and Frontal cortex + |
| Label | Primary motor cortex + |
| ModifiedDate | 7 May 2012 + |
| Page has default formThis property is a special property in this wiki. | PONS brain region + |
| PartiallyOverlapsWith | Brodmann 1909 area 4 human +, Precentral gyrus +, and Area 4 of cortex primary motor of PHT00 + |
| Species | Mammal + |
| SuperCategory | Regional part of brain + |
| Synonym | primary motor area + |
| TomoDefiningCriteria | 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. |