[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.
Habib
M
M
Service de Neurologie et Laboratoire de Neuroradiologie, CHU Timone, Marseille, France.
Levrier
O
O
Regis
J
J
Salamon
G
G
Khalil
R
R
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.