Brodmann area 6: Difference between revisions
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'''Brodmann area 6''' is part of the brain. |
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==Human== |
== Human == |
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Brodmann area 6 (BA6) is part of the [[frontal lobe|frontal]] [[cerebral cortex | cortex]] in the [[human brain]]. Situated just anterior to the [[primary motor cortex]] ([[Brodmann area 4|BA4]]), it is composed of the [[premotor cortex]] and, medially, the [[supplementary motor area]], or SMA. This large area of the frontal cortex is believed to play a role in the planning of complex, coordinated movements. |
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Brodmann area 6 is also called '''agranular frontal area 6''' in humans because it lacks an internal granular cortical layer (layer IV). It is a subdivision of the [[cytoarchitecture|cytoarchitecturally]] defined precentral region of cerebral cortex. In the human brain, it is located on the portions of the [[precentral gyrus]] that are not occupied by the [[gigantopyramidal area 4]]; furthermore, BA6 extends onto the caudal portions of the [[superior frontal gyrus|superior frontal]] and [[middle frontal gyrus|middle frontal gyri]]. It extends from the [[cingulate sulcus]] on the medial aspect of the hemisphere to the [[lateral sulcus]] on the lateral aspect. It is bounded rostrally by the granular frontal region and caudally by the gigantopyramidal area 4 (Brodmann, 1909). |
Brodmann area 6 is also called '''agranular frontal area 6''' in humans because it lacks an internal granular cortical layer (layer IV). It is a subdivision of the [[cytoarchitecture|cytoarchitecturally]] defined precentral region of cerebral cortex. In the human brain, it is located on the portions of the [[precentral gyrus]] that are not occupied by the [[gigantopyramidal area 4]]; furthermore, BA6 extends onto the caudal portions of the [[superior frontal gyrus|superior frontal]] and [[middle frontal gyrus|middle frontal gyri]]. It extends from the [[cingulate sulcus]] on the medial aspect of the hemisphere to the [[lateral sulcus]] on the lateral aspect. It is bounded rostrally by the granular frontal region and caudally by the gigantopyramidal area 4 (Brodmann, 1909). |
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==Guenon== |
== Guenon == |
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Brodmann area 6 is a cytoarchitecturally defined portion of the frontal lobe of the [[guenon]]. Brodmann-1909 regarded it as topographically and cytoarchitecturally [[homology (biology)|homologous]] to the human agranular frontal area 6 and noted that, in the monkey, area 4 is larger than area 6, whereas, in the human, area 6 is larger than area 4. Distinctive features (Brodmann-1905): It is thick relative to other cortical areas; the transition from cortex to subcortical [[white matter]] is gradual; cell layers are indistinct; and the internal [[granular layer]] (IV) is absent. |
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==External links== |
==External links== |
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Revision as of 16:49, 7 March 2011
| Brodmann area 6 | |
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| Identifiers | |
| NeuroNames | 1020 |
| NeuroLex ID | birnlex_1737 |
| FMA | 68602 |
| Anatomical terms of neuroanatomy | |
Brodmann area 6 is part of the brain.
Human
Brodmann area 6 (BA6) is part of the frontal cortex in the human brain. Situated just anterior to the primary motor cortex (BA4), it is composed of the premotor cortex and, medially, the supplementary motor area, or SMA. This large area of the frontal cortex is believed to play a role in the planning of complex, coordinated movements.
Brodmann area 6 is also called agranular frontal area 6 in humans because it lacks an internal granular cortical layer (layer IV). It is a subdivision of the cytoarchitecturally defined precentral region of cerebral cortex. In the human brain, it is located on the portions of the precentral gyrus that are not occupied by the gigantopyramidal area 4; furthermore, BA6 extends onto the caudal portions of the superior frontal and middle frontal gyri. It extends from the cingulate sulcus on the medial aspect of the hemisphere to the lateral sulcus on the lateral aspect. It is bounded rostrally by the granular frontal region and caudally by the gigantopyramidal area 4 (Brodmann, 1909).
Guenon
Brodmann area 6 is a cytoarchitecturally defined portion of the frontal lobe of the guenon. Brodmann-1909 regarded it as topographically and cytoarchitecturally homologous to the human agranular frontal area 6 and noted that, in the monkey, area 4 is larger than area 6, whereas, in the human, area 6 is larger than area 4. Distinctive features (Brodmann-1905): It is thick relative to other cortical areas; the transition from cortex to subcortical white matter is gradual; cell layers are indistinct; and the internal granular layer (IV) is absent.
External links
- ancil-41 at NeuroNames - agranular frontal area 6
- ancil-1044 at NeuroNames - Brodmann area 6
See also
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