Figure 2  Summary of inferior frontal gyrus (IFG) activations across studies. Table 1 shows the list of studies and centers of activation for semantic, syntactic, and phonological processing experiments showing significant activity in the left IFG. Semantic areas (shown in red) cluster around the anterior, inferior IFG (pars orbitalis); phonological regions center around the posterior superior IFG at the border of Brodmann's areas 44 and 6; syntax regions fall in the center near middle IFG in pars triangularis, area 44/45.

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Funtional MRI of language: New Approaches to Understanding the Cortical Organization of Semantic Processing
Susan Bookheimer
Annual Review of Neuroscience, March 2002, Vol. 25, Pages 151-188
(doi: 10.1146/annurev.neuro.25.112701.142946)