Pars triangularis is a region of the human cortex, located in the inferior frontal gyrus of the frontal lobe in the corresponding Brodmann area 45. The inferior frontal sulcus forms the superior boundary, the anterior horizontal ramus provides its inferior boundary, and the caudal boundary is made by the anterior ascending ramus (ascending branch of lateral sulcus). The pars triangularis contributes to propositional language comprehension, as in the dominant cortical hemisphere it contributes to the Broca's area. Lesions of the Pars triangularis lead to the characteristic findings of Expressive aphasia in individuals who are left hemispheric dominant. There is also extensive research on role of Pars triangularis and cortical functions such as language.
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