Transverse temporal gyrus
|Transverse temporal gyrus|
Human brain view on transverse temporal and insular gyri (gyri temporales transversi are #4)
|Part of||Temporal lobe|
|Parts||Primary auditory cortex|
|Latin||gyri temporales transversi|
|Anatomical terms of neuroanatomy|
The transverse temporal gyri, also called Heschl's gyri (/
Transverse temporal gyri are the first cortical structures to process incoming auditory information. Anatomically, the transverse temporal gyri are distinct in that they run mediolaterally (towards the center of the brain), rather than front to back as all other temporal lobe gyri run.
The transverse temporal gyri are active during auditory processing under fMRI for tone and semantic tasks. Transverse temporal gyri were found in one study to have significantly faster processing rates (33 Hz) in the left hemisphere compared to those in the right hemisphere (3 Hz). Additionally this difference in processing rate was found to be related to the volume of rate-related cortex in the gyri; right transverse temporal gryi were found to be more active during temporal processing, and these gryi were found to have more “rate-related cortex”. White and grey matter volumes of transverse temporal gyri were not found to relate to this processing speed, although larger white matter volumes in subjects are associated with increased sensitivity to “rapid auditory input”.
The role of transverse temporal gyri in auditory processing of tone is demonstrated by a study by Wong, Warrier et. al. (2008). This study revealed the following: subjects that could successfully form an association between Mandarin Chinese “pitch patterns” and word meaning were found to have transverse temporal gyri with larger volume than subjects who had “difficulty learning these associations.” Successful completion of the previous task was also found to be associated with a “greater concentration of white matter” in the left transverse temporal gyri of the subject. In general, larger transverse temporal gyri “could be associated with more efficient processing of speech-related cues which could facilitate learning and perceiving new speech sounds.”
The Heschl's gyri are named after Richard L. Heschl.
- "Heschl's Gyrus: Anatomic description and methods of identification in MRI" (PDF).
- Warrier, C; Wong, P; Penhune, V; Zatorre, R; Parrish, T; Abrams, D; Kraus, N (2009). "Relating structure to function: Heschl's Gyrus and acoustic processing" (PDF). J Neurosci. 29: 61–9. doi:10.1523/JNEUROSCI.3489-08.2009. PMC . PMID 19129385.
- The peri-sylvian aphasias
- Heschl’s Gyrus: Anatomic description and methods of identification in MRI
- Relating structure to function: Heschl’s Gyrus and acoustic processing
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