Saturday, February 26, 2011

Heschl's Gyrus

The Heschl's gyrus is any of three small gyri which are located in the superior temporal gyrus of the brain temporal lobe. Occupying Brodmann areas 41 and 42, the Heschl's gyri run transversely on the surface of the temporal lobe, bordering on the Sylvian fissure. They are separated by the transverse temporal sulci. These gyri are named after Richard L. Heschl.

Smaller left Heschl’s Gyrus volume in patients with schizotypal personality disorder has been observed. Individuals with schizophrenia spectrum disorders evince similar genetic, neurotransmitter, neuropsychological, electrophysiological, and structural abnormalities. Magnetic resonance imaging (MRI) studies have shown smaller gray matter volume in patients with schizotypal personality disorder than in matched comparison subjects in the left superior temporal gyrus, an area important for language processing. In a further exploration, the authors studied two components of the superior temporal gyrus: Heschl’s gyrus and the planum temporale. Left Heschl’s gyrus gray matter volume was 21% smaller in the schizotypal personality disorder subjects than in the comparison normal subjects.

Heschl's gyrus in upper temporal lobe viewed from above.