Inferior frontal gyrus

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Brain: Inferior frontal gyrus
Inferior frontal gyrus of the human brain.
Lateral surface of left cerebral hemisphere, viewed from the side.
Latin	'
Gray's	subject #189 822
Part of
Components
Artery
Vein
BrainInfo/UW	hier-67
MeSH	[1]

The inferior frontal gyrus makes up about one-third of the frontal lobe of the human brain. (A gyrus is one of the prominent "bumps" or "ridges" on the surface of the human brain.)

More of a region than a true gyrus, the inferior frontal gyrus includes:

• Broca's area, which is important for speech
• the representation of the face (that is, neurons controlling muscles of facial expression) in the primary motor cortex, Brodmann area 4

The borders of the inferior frontal gyrus are the inferior frontal sulcus above; the lateral sulcus below; and the precentral sulcus behind.

Telencephalon (cerebrum, cerebral cortex, cerebral hemispheres) - edit

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, corpus callosum, lateral ventricles, septum pellucidum, ependyma, internal capsule, corona radiata, external capsule 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.

This page uses content from the English-language version of Wikipedia. The original article was at Inferior frontal gyrus. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.