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L'iris complète la couche vasculaire du globe oculaire. Cette structure circulaire, développée à partie des corps cilliaires est la portion colorée de l'œil et présente une ouverture central : la pupille. Des fibres musculaires lisses contrôlent la taille de la pupille dans l'iris, les fibres organisées en structure circulaires constituent le muscle sphincter de la pupille. Les fibres disposées en structures radiales constituent le muscle dilatateur de la pupille.
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