[Divergent asymmetries of the temporo-parietal cortical areas: anatomo-functional correlations and evolutionary and developmental implications].
Human brains present a clear asymmetry of the postero-lateral cortical area, so called "planum temporale" (Geschwind and Levitsky). This asymmetry is on favour of the left brain. A similar asymmetry is observed on the parietal operculum. MRI studies of 37 healthy volunteers have shown a clear difference between individuals. Mixing the index of temporal and parietal asymmetry, the authors consider four types: the most frequent pattern concerns 90% of right handed. For the others, 10% there are left handed as right handed. On conclusion, planum as many asymmetry and opercular asymmetry can be divergent, and both canan to determines handedness.
Service de Neurologie et Laboratoire de Neuroradiologie, CHU Timone, Marseille, France.
M
M
Habib
O
O
Levrier
J
J
Regis
G
G
Salamon
R
R
Khalil
D000293:Adolescent; D000328:Adult; D005075:Biological Evolution; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010296:Parietal Lobe / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology; D013702:Temporal Lobe / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology
Asymétries divergentes des aires corticales temporo-pariétales: corrélations anatomo-fonctionnelles et implications évolutives et développementales.