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Notes de cours système extra pyramidal
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un rappel sur le système extra pyramidal , la sémiologie , les examens complémentaire et le traitement
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Syndrome extra pyramidalTAZI Samy
CHU
Se
neuro
,plan du cour
• rappel anatomique
• Syndromes extra-pyramidales
• Définition
• étiologies
• Le syndrome parkinsonien
• Le mouvement athétosique
• Les dystonies
• Le mouvement choréique
• Le mouvement ballique (hémiballisme )
• Diagnostic différentiel
• Traitement
• bibliographie
, I. rappel anatomique
Définition
• Le système extra-pyramidal est annexé à la voie motrice
principale
• il aboutit au motoneurone périphérique
• Désigne les circuits nerveux responsables de la motricité
involontaire, notamment réflexe, et du contrôle de la postu
• il est formé des noyaux gris centraux :
• Noyau caudé Corps de Luys
• Putamen Noyau rouge
• Pallidum Locus niger
• Ses noyaux aboutissent à une série de faisceaux
, 1.Le faisceau
rubrospinal
• Il part du noyau rouge et suit un
trajet parallèle au faisceau
corticospinal latéral
• intervient dans la motricité et la
coordination des muscles
distaux des membres
supérieurs.
• Le noyau rouge ne reçoit
aucune afférence du système
des ganglions de la base et est
lié au système cérébelleux
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