Divisions
The inferior frontal gyrus can be subdivided into the following macroanatomical structures, shown in yellow in the top image, just below the label gyrus frontalis inferior:
- Pars opercularis (cortex posterior to the ascending ramus of the lateral fissure)
- Pars triangularis (cortex between the ascending ramus and the horizontal ramus of the lateral fissure)
- Pars orbitalis (cortex inferior and anterior to the horizontal ramus of the lateral fissure)
The inferior frontal gyrus includes the following cytoarchitectonic areas:
- Brodmann area 44
- Brodmann area 45
- Brodmann area 47
- cytoarchitectonic areas of the deep frontal operculum
The cytoarchitectonic areas very roughly correspond to the following macroanatomic structures: Brodmann area 44 to Pars opercularis, Brodmann area 45 to Pars triangularis, and Brodmann area 47 to Pars orbitalis. Brodmann area 44 corresponds to Broca's area (sometimes Broca's area is taken to encompass Brodmann's areas 44 and 45) — for the dominant hemisphere of the brain.
Read more about this topic: Inferior Frontal Gyrus
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