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Les reins: 1. sont des organes pairs intrapéritonéaux situés de part et d'autre de la colonne vertébrale dans la cavité abdominale. 2. comportent une zone hilaire interne d'où arrivent et partent les éléments vasculaires, lymphatiques et le système excréteur 3. comportent des cavités excrétrices formées des calices, des tiges et du pyélon tapissées d'un fin revêtement monocellulaire adapté à l'agression chimique de l'urine 4. reçoivent leur vascularisation des artères rénales issues du tronc coeliaque
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