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:
The frontal lobe comprises four major folds of cortical tissue: the primary motor cortex, superior frontalgyrus and the middle frontalgyrus of the frontal gyri, and the inferiorfrontalgyrus.
The precentral gyrus is in front of the central sulcus, and behind the precentral sulcus, which separates it from the frontal gyri.
People who have damaged frontal lobes may experience problems with these aspects of cognitive function, being at times impulsive; impaired in their ability to plan and execute complex sequences of actions; perhaps persisting with one course of action or pattern of behavior when a change would be appropriate (perseveration).
The lateral sulcus separates the inferiorfrontalgyrus of lower frontal lobes from the temporal lobes.
In the human brain, the precentral gyrus and the related cortical tissue that folds into the central sulcus comprise the primary motor cortex, which controls voluntary movements of specific body parts associated with areas of the gyrus.
Frontal lobotomy (sometimes called frontal leucotomy) successfully reduced distress but at the cost of often blunting the subject's emotions, volition and personality.
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