Brodmann area 8
| Brodmann area 8 | |
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| File:Brodmann area 8.png
Image of brain with Brodmann area 8 shown in red
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| File:Brodmann Cytoarchitectonics 8.png
Image of brain with Brodmann area 8 shown in orange
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| Details | |
| Latin | Area frontalis intermedia |
| Identifiers | |
| NeuroNames | ancil-45 |
| NeuroLex ID | Brodmann area 8 |
| TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of neuroanatomy
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
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Brodmann area 8 is one of Brodmann's cytologically defined regions of the brain. It is involved in planning complex movements.
Contents
Human
Brodmann area 8, or BA8, is part of the frontal cortex in the human brain. Situated just anterior to the premotor cortex (BA6), it includes the frontal eye fields (so-named because they are believed to play an important role in the control of eye movements). Damage to this area, by stroke, trauma or infection, causes tonic deviation of the eyes towards the side of the injury. This finding occurs during the first few hours of an acute event such as cerebrovascular infarct (stroke) or hemorrhage (bleeding).
Guenon
The term Brodmann area 8 refers to a cytoarchitecturally defined portion of the frontal lobe of the guenon. Located rostral to the arcuate sulcus, it was not considered by Brodmann-1909 to be topographically homologous to the intermediate frontal area 8 of the human.
Distinctive features (Brodmann-1905): compared to Brodmann area 6-1909, area 8 has a diffuse but clearly present internal granular layer (IV); sublayer 3b of the external pyramidal layer (III) has densely distributed medium-sized pyramidal cells; the internal pyramidal layer (V) has larger ganglion cells densely distributed with some granule cells interspersed; the external granular layer (II) is denser and broader; cell layers are more distinct; the abundance of cells is somewhat greater.[1]
Functions
The area is involved in the management of uncertainty. A functional magnetic resonance imaging study demonstrated that brodmann area 8 activation occurs when test subjects experience uncertainty, and that with increasing uncertainty there is increasing activation.[2]
An alternative interpretation is that this activation in frontal cortex encodes hope, a higher-order expectation positively correlated with uncertainty.[3]
Image
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Brodmann area 8 animation small.gif
Animation.
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Brodmann area 8 frontal.jpg
front view.
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Brodmann area 8 lateral.jpg
Lateral view.
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Brodmann area 8 medial.jpg
Medial view.
See also
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Wikimedia Commons has media related to Brodmann area 8. |
