Inferior parietal lobule

Last revised by Daniel J Bell on 21 Apr 2021

The inferior parietal lobule (IPL), also known as Geschwind territory or area, is one of the three divisions of the parietal lobe. It is composed of a supramarginal gyrus rostrally and an angular gyrus caudally. It is involved with sensorimotor integration, spatial attention and visuomotor and auditory processing 1.

The inferior parietal lobule is separated from the superior parietal lobule (SPL) by the intraparietal sulcus. It is bounded by the post central sulcus anteriorly, temporo-occipital line laterally, parieto-occipital sulcus posteriorly and intraparietal sulcus medially.

The chief blood supply of the inferior parietal lobule is from the middle cerebral artery.

Norman Geschwind (1926-1984) was an American neurologist with a major influence on the neurology of behavior 3.

Damage to the dominant inferior parietal lobule may lead to impairment of speech repetition 2.

The posterior ascending ramus (of the Sylvian fissure) sign states that the Sylvian fissure extends into the anterior portion of the inferior parietal lobule. The gyrus which caps this fissure is the supramarginal gyrus.

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