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)