{"id":7233,"date":"2026-05-04T16:12:18","date_gmt":"2026-05-04T13:12:18","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/membrane-arachnoidienne\/"},"modified":"2026-06-25T12:15:02","modified_gmt":"2026-06-25T09:15:02","slug":"membrane-arachnoidienne","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/membrane-arachnoidienne\/","title":{"rendered":"Membrane arachno\u00efdienne"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La membrane arachno\u00efdienne (d\u00e9riv\u00e9e du grec <em>arachne<\/em> \u2014 araign\u00e9e et <em>eidos<\/em> \u2014 forme, apparence; lat. <em>mater<\/em> \u2014 m\u00e8re, protectrice) est l&rsquo;interm\u00e9diaire des trois m\u00e9ninges qui prot\u00e8gent le syst\u00e8me nerveux central. <\/p>\n\n<p class=\"wp-block-paragraph\">Elle consiste en une membrane extr\u00eamement fine, transparente et d\u00e9pourvue de ses propres vaisseaux sanguins, situ\u00e9e pr\u00e9cis\u00e9ment entre la dure-m\u00e8re et la pie-m\u00e8re.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\"><strong>\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">Elle tire son nom des nombreux faisceaux de tissus conjonctifs fins (trab\u00e9cules). Ils partent de sa face interne et s&rsquo;entrecroisent en formant un r\u00e9seau serr\u00e9 ressemblant \u00e0 une toile d&rsquo;araign\u00e9e, s&rsquo;attachant \u00e0 la pie-m\u00e8re sous-jacente.<\/p>\n\n<p class=\"wp-block-paragraph\">\u00c0 la diff\u00e9rence de la pie-m\u00e8re, la membrane arachno\u00efdienne ne p\u00e9n\u00e8tre pas dans les sillons et circonvolutions du cerveau, mais s&rsquo;\u00e9tend au-dessus d&rsquo;eux comme un film tendu. L&rsquo;espace sous cette membrane est rempli de liquide c\u00e9phalorachidien. Cela cr\u00e9e un coussin hydrodynamique id\u00e9al dans lequel le cerveau est log\u00e9 et qui amortit les chocs. \u00c0 l&rsquo;ext\u00e9rieur, la membrane arachno\u00efdienne adh\u00e8re \u00e9troitement \u00e0 la dure-m\u00e8re, mais ne fusionne pas physiquement avec elle.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\"><strong>Importance clinique<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">En traumatologie, cette structure anatomique joue un r\u00f4le cl\u00e9 dans la formation de plusieurs types d&rsquo;h\u00e9morragies. Les vaisseaux veineux qui la traversent peuvent, en se rompant, lib\u00e9rer du sang \u00e0 la surface de la membrane, formant un h\u00e9matome sous-dural. Des dommages aux art\u00e8res situ\u00e9es en dessous peuvent entra\u00eener une h\u00e9morragie sous-arachno\u00efdienne.<\/p>\n\n<p class=\"wp-block-paragraph\">De plus, en cas de fractures du cr\u00e2ne ou de forts coups, la membrane arachno\u00efdienne elle-m\u00eame peut \u00eatre d\u00e9chir\u00e9e. Dans ce cas, le liquide c\u00e9phalorachidien sous pression peut s&rsquo;\u00e9couler \u00e0 l&rsquo;ext\u00e9rieur et s&rsquo;accumuler sous forme de lentille aquatique pathologique \u2014 hygroma sous-dural. Cet amas de liquide peut comprimer le cerveau de mani\u00e8re tr\u00e8s similaire \u00e0 un caillot sanguin dense.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La membrane arachno\u00efdienne (d\u00e9riv\u00e9e du grec <em>arachne<\/em> \u2014 araign\u00e9e et <em>eidos<\/em> \u2014 forme, apparence; lat. <em>mater<\/em> \u2014 m\u00e8re, protectrice) est l&rsquo;interm\u00e9diaire des trois m\u00e9ninges qui prot\u00e8gent le syst\u00e8me nerveux central. <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-7233","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Membrane arachno\u00efdienne : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"La membrane arachno\u00efdienne (d\u00e9riv\u00e9e du grec arachne \u2014 araign\u00e9e et eidos \u2014 forme, apparence; 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