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In this article, we present the organisation of the brain areas involved in the handwriting of adults and describe recent data on this organisation in the brain of children under learning. In adults, the network involved comprises a set of left-to-frontal regions, the left fusion gyrus and the right cervelet. These regions code the spelling and driving aspects of handwriting. In children aged between eight and 11 years, the regions well described in adults are also active: the writing network is already structured. However, differences between the two groups in the level of activation of certain elements of the network, in the recruitment of other regions or in the side of activations indicate an ongoing process of automation. ; International audience ; In this article, we present the organisation of the brain areas involved in the handwriting of adults and describe recent data on this organisation in the brain of children under learning. In adults, the network involved comprises a set of left-to-frontal regions, the left fusion gyrus and the right cervelet. These regions code the spelling and driving aspects of handwriting. In children aged between eight and 11 years, the regions well described in adults are also active: the writing network is already structured. However, differences between the two groups in the level of activation of certain elements of the network, in the recruitment of other regions or in the side of activations indicate an ongoing process of automation. ; Dans cet article, nous présentons l'organisation des aires cérébrales impliquées dans l'écriture manuscrite chez l'adulte, et nous décrivons des données récentes sur cette organisation dans le cerveau d'enfants en cours d'apprentissage. Chez l'adulte, le réseau impliqué comprend un ensemble de régions pariéto-frontales gauches, le gyrus fusiforme gauche et le cervelet droit. Ces régions codent les aspects orthographiques et moteurs de l'écriture manuscrite. Chez l'enfant de huit à 11 ans, les régions bien décrites chez l'adulte sont ...