The role of medial and orbital cerebral regions in language functions

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  • Otsuki Mika
    Graduate School of Health Sciences, Hokkaido University

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  • 言語における「大脳内側面・底面（眼窩面）」の役割

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<p>Supplementary motor area (SMA) is regarded as including two separate areas; preSMA and SMAproper. Both preSMA and SMAproper have the relationship with language function, in particular preSMA has specific fiber tracts between prefrontal area and seems to have strong relation with language which has been evidenced by fMRI studies and clinical reports. Left medial frontal lesions cause supplementary motor area aphasia with characteristic symptoms: reduced spontaneous speech with prominent contrast of preserved ability of confrontation naming and severe impairment of word fluency. Right medial frontal lesions might cause affective prosody impairment. Regarding left medial parietal lesions, some clinical reports indicate a possibility of the relation between medial parietal region and language comprehension ability. Orbitofrontal lesion has been reported to show narrative impairments.</p>

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