The transverse temporal gyri, also called Heschl gyri, are one or two short gyri that run obliquely across the upper surface of the superior temporal gyrus, hidden deep in the lateral sulcus. They contain the primary auditory cortex (Brodmann areas 41 and 42). They receive input from the medial geniculate body of the thalamus.
| Location | Upper surface of the superior temporal gyrus, within the floor of the lateral sulcus |
|---|---|
| Parts |
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| Connections |
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| Blood Supply | Middle cerebral artery (temporal branches) |
Houses the primary auditory cortex, which first processes sound in the cortex, mapping pitch in an orderly frequency map.
Because each ear projects to both sides of the brain, damage to one Heschl gyrus rarely causes deafness, but bilateral lesions cause cortical deafness. Lesions can impair sound localisation and processing of rapid sound changes. Seizures here may produce simple sounds such as buzzing or ringing.
Loss of conscious hearing despite normal ears, from bilateral damage to the primary auditory cortex.
Brief simple auditory hallucinations such as buzzing from focal seizures in Heschl gyri.
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