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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 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.
The premotor cortex is an area of the motor cortex lying within the frontal lobe of the brain just anterior to the primary motor cortex. It occupies part of Brodmann's area 6. It has been studied mainly in primates, including monkeys and humans. The functions of the premotor cortex are diverse and not fully understood.
For example, Brodmann areas 1, 2 and 3 are the primary somatosensory cortex; area 4 is the primary motor cortex; area 17 is the primary visual cortex; and areas 41 and 42 correspond closely to primary auditory cortex.
Brodmann area 8. The frontal eye fields (FEF) are a region located in the frontal cortex, more specifically in Brodmann area 8 or BA8, [1] of the primate brain.In humans, it can be more accurately said to lie in a region around the intersection of the middle frontal gyrus with the precentral gyrus, consisting of a frontal and parietal portion. [2]
It includes portions of the frontal and parietal lobes: [2] The anterior portion of the paracentral lobule is part of the frontal lobe and contains a little portion of Brodmann's area 6 (SMA): this is because the paracentral sulcus (branch of the cingulate sulcus) does not correspond to the precentral sulcus on the medial plane.
Brodmann area 45 and 44 overlap with the Broca's area for language in humans; Brodmann area 1, 2, and 3 in the postcentral gyrus of the parietal lobe (the somatosensory region) Brodmann area 4 in the precentral gyrus of the frontal lobe (the primary motor area) Brodmann area 17 and 18 in the occipital lobe (the primary visual areas).
It is attributed to the anatomical structures of Brodmann's area (BA) 47, 45 and 44 (considered the subregions of the VLPFC – the anterior, mid and posterior subregions). Specific functional distinctions have been presented between the three Brodmann subregions of the VLPFC.
Cytoarchitecturally it is bounded dorsally by the granular frontal area 9, caudally by the middle frontal area 46, and ventrally by the orbital area 47 and by the rostral area 12 or, in an early version of Brodmann's cortical map (Brodmann-1909), the prefrontal Brodmann area 11-1909. [4]