Pars triangularis

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Brain: Pars triangularis
Lateral surface of left cerebral hemisphere, viewed from the side. (Pars triangularis visible near bottom left).
Inferior frontal gyrus. Pars triangularis is not labeled, but is at bottom of region.
Part of Inferior frontal gyrus, Broca's area
Artery middle cerebral
NeuroNames hier-68

The Pars triangularis is the portion of the inferior frontal gyrus that lies between the vertical and the horizontal ramus of the lateral sulcus. It is called triangularis because it often has a triangular shape.

It is part of Broca's area.

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Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres)
primary sulci/fissures medial longitudinal, lateral, central, parietoöccipital, calcarine, cingulate
frontal lobe precentral gyrus (primary motor cortex, 4), precentral sulcus, superior frontal gyrus (6, 8), middle frontal gyrus (46), inferior frontal gyrus (Broca's area, 44-pars opercularis, 45-pars triangularis), prefrontal cortex (orbitofrontal cortex, 9, 10, 11, 12, 47)
parietal lobe postcentral sulcus, postcentral gyrus (1, 2, 3, 43), superior parietal lobule (5), inferior parietal lobule (39-angular gyrus, 40), precuneus (7), intraparietal sulcus
occipital lobe primary visual cortex (17), cuneus, lingual gyrus, 18, 19 (18 and 19 span whole lobe)
temporal lobe transverse temporal gyrus (41-42-primary auditory cortex), superior temporal gyrus (38, 22-Wernicke's area), middle temporal gyrus (21), inferior temporal gyrus (20), fusiform gyrus (36, 37)
limbic lobe/fornicate gyrus cingulate cortex/cingulate gyrus, anterior cingulate (24, 32, 33), posterior cingulate (23, 31),
isthmus (26, 29, 30), parahippocampal gyrus (piriform cortex, 25, 27, 35), entorhinal cortex (28, 34)
subcortical/insular cortex rhinencephalon, olfactory bulb, olfactory tract, corpus callosum (splenium, genu, rostrum), lateral ventricles, septum pellucidum, ependyma, internal capsule, corona radiata, external capsule, fornix (commissure of fornix), anterior commissure, posterior commissure
hippocampal formation dentate gyrus, hippocampus, subiculum
basal ganglia striatum (caudate nucleus, putamen), lentiform nucleus (putamen, globus pallidus), claustrum, extreme capsule, amygdala, nucleus accumbens
Some categorizations are approximations, and some Brodmann areas span gyri.
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