{"id":1085,"date":"2025-07-11T12:51:25","date_gmt":"2025-07-11T12:51:25","guid":{"rendered":"https:\/\/studenthub.elsevier.com\/fr\/?p=1085"},"modified":"2025-07-23T10:46:44","modified_gmt":"2025-07-23T10:46:44","slug":"systeme-lymphatique","status":"publish","type":"post","link":"https:\/\/studenthub.elsevier.com\/fr\/anatomy-basics\/systeme-lymphatique\/","title":{"rendered":"Syst\u00e8me lymphatique"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Vaisseaux lymphatiques<\/h2>\n\n\n\n<p><br>Les vaisseaux lymphatiques forment un r\u00e9seau complexe et extensif de canaux interconnect\u00e9s, qui commencent au niveau des capillaires lymphatiques poreux et borgnes au sein des tissus du corps humain, puis convergent pour former plusieurs vaisseaux de taille plus importante qui se jettent enfin dans de grandes veines \u00e0 la base du cou. <\/p>\n\n\n\n<p>Les vaisseaux lymphatiques collectent principalement les liquides perdus par les lits capillaires lors des processus d&#8217;\u00e9changes nutritifs, et les ram\u00e8nent vers le syst\u00e8me vasculaire veineux (fig. 1.30). Des agents pathog\u00e8nes, des cellules du syst\u00e8me lymphatique, des produits et des d\u00e9bris cellulaires sont \u00e9galement contenus dans le liquide interstitiel qui se draine dans les capillaires lymphatiques.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"650\" src=\"https:\/\/studenthub.elsevier.com\/fr\/wp-content\/uploads\/sites\/13\/2025\/07\/Student-Hub-image-5.png\" alt=\"\" class=\"wp-image-1135\" srcset=\"https:\/\/studenthub.elsevier.com\/fr\/wp-content\/uploads\/sites\/13\/2025\/07\/Student-Hub-image-5.png 800w, https:\/\/studenthub.elsevier.com\/fr\/wp-content\/uploads\/sites\/13\/2025\/07\/Student-Hub-image-5.png?resize=300,244 300w, https:\/\/studenthub.elsevier.com\/fr\/wp-content\/uploads\/sites\/13\/2025\/07\/Student-Hub-image-5.png?resize=768,624 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p><em>Fig. 1.30: Syst\u00e8me lymphatique. Drake, Mitchell &amp; Vogl. Gray&#8217;s Anatomie, le manuel pour les \u00e9tudiants, 5e Ed. 2025. \u00a9 Elsevier.<\/em><\/p>\n\n\n\n<p>Dans l&#8217;intestin gr\u00eale, certaines graisses absorb\u00e9es par l&#8217;\u00e9pith\u00e9lium intestinal sont incorpor\u00e9es \u00e0 des complexes lipoprotidiques (chylomicrons), qui sont relargu\u00e9s par les cellules \u00e9pith\u00e9liales dans le compartiment interstitiel. Avec d&#8217;autres composants du<br>liquide interstitiel, les chylomicrons se drainent dans les capillaires lymphatiques (d\u00e9sign\u00e9s comme capillaires lact\u00e9aux dans l&#8217;intestin gr\u00eale) et sont finalement rejet\u00e9s dans le syst\u00e8me veineux du cou. Le syst\u00e8me lymphatique est ainsi la principale voie de transport pour les graisses absorb\u00e9es par l&#8217;intestin. <\/p>\n\n\n\n<p>Le liquide de la plupart des vaisseaux lymphatiques est clair et incolore, et est d\u00e9sign\u00e9 sous le terme de lymphe. Le liquide des vaisseaux lymphatiques de l&#8217;intestin gr\u00eale est lactescent en raison<br>de la pr\u00e9sence des chylomicrons; il est appel\u00e9 liquide chyleux. <\/p>\n\n\n\n<p>Il existe des vaisseaux lymphatiques dans la majorit\u00e9 des r\u00e9gions du corps, y compris ceux qui sont associ\u00e9s au syst\u00e8me nerveux central (Louveau A et al., Nature 2015; 523 : 337-41; Aspelund A et al., J Exp Med 2015; 212 : 991-9; Absinta M et al., eLIFE 2017; 6 : e29738). <\/p>\n\n\n\n<p>Les exceptions comprennent la moelle osseuse et des tissus avasculaires tels que les \u00e9pith\u00e9liums et le cartilage. <\/p>\n\n\n\n<p>Les mouvements de la lymphe dans les vaisseaux lymphatiques sont principalement g\u00e9n\u00e9r\u00e9s par l&#8217;action indirecte des structures adjacentes, notamment par la contraction des musclessquelettiques et les pulsations art\u00e9rielles. Un flux unidirectionnel est maintenu par la pr\u00e9sence de valves dans les vaisseaux.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vaisseaux lymphatiques Les vaisseaux lymphatiques forment un r\u00e9seau complexe et extensif de canaux interconnect\u00e9s, qui commencent au niveau des capillaires lymphatiques poreux et borgnes au sein des tissus du corps humain, puis convergent pour former plusieurs vaisseaux de taille plus importante qui se jettent enfin dans de grandes veines \u00e0 la base du cou. Les [&hellip;]<\/p>\n","protected":false},"author":168,"featured_media":1092,"comment_status":"open","ping_status":"open","sticky":false,"template":"wp-custom-template-template-anatomy-basics","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anatomy-basics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Syst\u00e8me lymphatique - Student Hub France<\/title>\n<meta name=\"description\" content=\"Explorez le syst\u00e8me lymphatique avec &quot;Gray\u2019s Anatomie, le manuel pour les \u00e9tudiants&quot;, un incontournable pour les \u00e9tudiants en m\u00e9decine. 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Le corps est dit en position anatomique dans la situation debout, les pieds r\u00e9unis, les mains sur les c\u00f4t\u00e9s du corps, paumes tourn\u00e9es en avant. 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