Motor representation of the hand in the human cortex: an f-MRI study with a conventional 1.5 T clinical unit.
Ital J Neurol Sci
; 19(5): 277-84, 1998 Oct.
Article
en En
| MEDLINE
| ID: mdl-10933447
ABSTRACT
The purpose of this study was to show a gradient of possible bilateral activation for movements of the non-dominant vs. dominant hand, as well as for areas involved in complex vs. simple hand movements. A standard 1.5 T magnetic resonance imaging (MRI) system has been utilized to localize the cortical motor hand areas, using the blood oxygen level dependent contrast (BOLDc) technique and single-section fast low-angle shot (FLASH) imaging. Ten normal right-handed subjects volunteered for the study. The motor tasks consisted of simple (flexion-extension) finger movements of either hand, and complex movements (finger-to-thumb opposition in a repeating, pre-planned sequence) of the non-dominant hand. Simple movements caused contralateral activation of the primary motor area (MA); ipsilateral activation was observed for the non-dominant hand only. Supplementary motor area (SMA) was also activated, with a clear contralateral prevalence. The ratio of bilateral activation of MA did not change with complex movements of the non-dominant hand, while SMA as well as lateral premotor area were largely bilaterally activated in this task. In conclusion, the ipsilateral MA is activated for movements--even simple--performed with the non-dominant hand. There is widespread functional activity, involving both contralateral and ipsilateral SMA, for complex movements.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Mano
/
Corteza Motora
/
Movimiento
Tipo de estudio:
Risk_factors_studies
Límite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Ital J Neurol Sci
Año:
1998
Tipo del documento:
Article
País de afiliación:
Italia