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Left medial parietal lobe and receptive language functions

Mixed transcortical aphasia after left antmior cerebral artery infarction

Department of Neurology, University of Texas Health Science Center at Dallas, Dallas, TX.

Three aphasic patients with infarctions involving the left anterior cerebral artery have been studied. Two had transcortical motor aphasia, and one had mixed transcortical (or isolation) aphasia. Based on computerized tomography in two patients and whole-brain sections in one, the patient with mixed transcortical aphasia had a lesion that went beyond the rolandic fissure to involve the anterior precuneus lobule of the left medial parietal lobe. In the patients with transcortical motor aphasia, the lesion was confined to the frontal lobe. From these cases and other data, it seems likely that the left medial parietal lobe has receptive language functions analogous to the motor language functions of the left medial frontal lobe, thus accounting for the mixed transcortical aphasia observed in the patient whose left anterior cerebral artery infarction involved both the medial parietal and medial frontal lobes.

Address correspondence and reprint requests to Dr. Ross, Department of Neurology, University of Texas Health Science Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75235.

Accepted for publication July 13, 1979.

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