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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Ann N Y Acad Sci. 2011 May;1225(Suppl 1):E182–E191. doi: 10.1111/j.1749-6632.2011.06001.x

Figure 1.

Figure 1

Summary of results from a DTI study by Rilling et al. [34] comparing the organization of the arcuate fasciculus, a white-matter bundle conveying fibers between the frontal lobe and posterior cortex, in humans (Homo sapiens) and chimpanzees (Pan troglodytes). In both species, the arcuate fasciculus (AF) carries fibers between frontal language cortex, including areas 44, 45, and 47 (Broca’s area), and posterior language cortex, including area 22 (Wernicke’s area) and the inferior parietal lobule (areas 40 and 39). In humans, however, the AF carries fibers from middle temporal cortex (area 21) that represent word meanings. Fibers also pass between the temporal and frontal lobes via a ventral pathway (V), which is relatively prominent in chimpanzees and macaques (not shown).