Transverse temporal gyrus: Definition from Answers.com

Brain: Transverse temporal gyrus

Section of brain showing upper surface of temporal lobe. ("Transverse temporal gyri" visible at center left.)

Human brain view on transverse temporal and insular gyri (Gyri temporales transversum is #4)
Latin	gyri temporales transversi
Gray's	subject #189 824
Part of	Temporal lobe
Components	Primary auditory cortex
Artery	Middle cerebral
NeuroNames	ancil-655

The transverse temporal gyri (also called Heschl's gyri or Heschl's convolutions) are found in the area of primary auditory cortex in the superior temporal gyrus of the human brain, occupying Brodmann areas 41 and 42. It is the first cortical structure 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 dorsiventrally (front to back) as all other temporal lobe gyri run.

The Heschl's gyri are named after Richard L. Heschl.

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References

The peri-sylvian aphasias

Human brain: telencephalon (cerebrum · cerebral cortex · cerebral hemispheres, grey matter) (TA A14.1.09.002-240, 301-320, GA 9.818-826)

Frontal lobe

Superolateral	Precentral gyrus (Primary motor cortex, 4) Superior frontal gyrus/Frontal eye fields (6, 8, 9) · Middle frontal gyrus (46) · Inferior frontal gyrus/Broca's area (44-Pars opercularis, 45-Pars triangularis) Prefrontal cortex (Ventromedial) · Premotor cortex Precentral sulcus · Superior frontal sulcus · Inferior frontal sulcus

Medial/inferior	Subcallosal area · Paraterminal gyrus · Paraolfactory area · Straight gyrus · Paracentral lobule Orbitofrontal cortex (10, 11, 12, 47) Olfactory sulcus

Parietal lobe

Superolateral	Somatosensory cortex (Primary (1 · 2 · 3 · 43) · Secondary (5)) · Parietal operculum Parietal lobules (Superior (7l) · Inferior (40)) · Angular gyrus (39) Intraparietal sulcus

Medial/inferior	Paracentral lobule · Precuneus (7m) Marginal sulcus

Occipital lobe

Superolateral	Occipital pole of cerebrum · Lunate sulcus · Transverse occipital sulcus · Lateral occipital gyrus (18, 19))

Medial/inferior	Primary visual cortex (17) · Cuneus · Lingual gyrus Calcarine fissure

Temporal lobe

Superolateral	Transverse temporal gyrus/Primary auditory cortex (41, 42) · Superior temporal gyrus (38, 22/Wernicke's area) · Middle temporal gyrus (21) · Inferior temporal gyrus (20) Superior temporal sulcus · Inferior temporal sulcus

Medial/inferior	Fusiform gyrus (37) Medial temporal lobe ((27 · 28 · 34 · 35 · 36)) Inferior temporal sulcus

Interlobar
sulci/fissures

Superolateral	Central (frontal+parietal) · Lateral (frontal+parietal+temporal) · Parieto-occipital · Preoccipital notch

Medial/inferior	Medial longitudinal · Cingulate (frontal+cingulate) · Collateral (temporal+occipital) · Callosal sulcus

Limbic lobe

Parahippocampal gyrus · Entorhinal cortex · Prepyriform area · Uncus · Fimbria of hippocampus · Dentate gyrus

Cingulate cortex/gyrus: Subgenual area (25) · Anterior cingulate (24, 32, 33) · Posterior cingulate (23, 31) · Retrosplenial cortex (26, 29, 30)

Hippocampal sulcus

Insular lobe

Circular sulcus of insula

General

Operculum · Poles of cerebral hemispheres

Some categorizations are approximations, and some Brodmann areas span gyri.

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