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✓ Dure-mère :o La plus externe des enveloppes du SNC,o C’est une membrane fibreuse plus ou moins épaisse : elle forme une longue gaine légèrement aplatie dorso-ventralement,o Moulée sur la paroi de la cavité crânienne,o Séparé de la paroi du canal vertébral par la cavité épidurale.✓ Arachnoïde :o Méninge intermédiaire mince et délicate,o Sa face externe est séparée de la dure mère par la cavité subdurale,o Face profonde va jusqu’à la pie-mère à travers la cavité subarachnoïdienne via des prolongements nombreux et fins.✓ Pie-mère :o Mince membrane conjonctivo-vasculaire,o Adhère au SNC dont elle épouse la forme.
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