{"id":1454,"date":"2025-05-26T09:36:26","date_gmt":"2025-05-26T09:36:26","guid":{"rendered":"https:\/\/urolistic.com\/?p=1454"},"modified":"2025-05-27T08:05:28","modified_gmt":"2025-05-27T08:05:28","slug":"comprender-la-estructura-del-sistema-urinario","status":"publish","type":"post","link":"https:\/\/urolistic.com\/fr\/blog\/2025\/05\/26\/comprender-la-estructura-del-sistema-urinario\/","title":{"rendered":"Comprendre la structure du syst\u00e8me urinaire"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"1454\" class=\"elementor elementor-1454\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2051556a e-flex e-con-boxed e-con e-parent\" data-id=\"2051556a\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5641472d elementor-widget elementor-widget-text-editor\" data-id=\"5641472d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La structure et le fonctionnement du syst\u00e8me urinaire sont tr\u00e8s complexes. Je vais donc essayer d'expliquer de mani\u00e8re simple mais logique tout ce qui se passe autour du syst\u00e8me excr\u00e9teur et de la miction, afin que vous puissiez plus tard comprendre la raison de toutes ces recommandations et, en vous responsabilisant, op\u00e9rer des changements dans votre vie qui vous permettront de souffrir moins souvent de cystites inconfortables ou d'autres affections urinaires plus graves.<\/p>\n<p>\u00a0Le syst\u00e8me urinaire se compose des reins, qui sont les organes producteurs d'urine, d'une part, et du syst\u00e8me py\u00e9localiciel, des uret\u00e8res, de la vessie et de l'ur\u00e8tre, qui sont les organes excr\u00e9teurs de l'urine, d'autre part. La grande majorit\u00e9 des maladies urologiques sont bas\u00e9es sur le syst\u00e8me excr\u00e9teur. C'est pourquoi je me concentrerai sur ce syst\u00e8me pour donner un bref r\u00e9sum\u00e9 de l'anatomie et de la physiologie (comment il fonctionne dans des conditions normales), sans aborder la structure complexe de l'int\u00e9rieur du rein, qui n'a que peu d'int\u00e9r\u00eat pour le sujet qui nous occupe.<\/p>\n<p>\u00a0Le syst\u00e8me excr\u00e9teur urinaire est constitu\u00e9 de plusieurs couches de tissus<strong>.<\/strong> De l'int\u00e9rieur vers l'ext\u00e9rieur, et de mani\u00e8re tr\u00e8s simplifi\u00e9e, on trouve la muqueuse, qui est le rev\u00eatement int\u00e9rieur du bassinet r\u00e9nal, des uret\u00e8res, de la vessie et de l'ur\u00e8tre. Sa fonction est d'agir comme une barri\u00e8re imperm\u00e9able au passage de l'urine. Les cellules qui tapissent cette muqueuse, appel\u00e9es cellules uroth\u00e9liales, ont la particularit\u00e9 de poss\u00e9der \u00e0 leur surface une s\u00e9rie de prot\u00e9ines, les uroplakines, dont la fonction est, entre autres, de prot\u00e9ger le syst\u00e8me excr\u00e9teur contre les infections. Cependant, certains germes, comme la bact\u00e9rie<\/p>\n<p><em>\u00a0Escherichia coli<\/em> cause fr\u00e9quente d'infections des voies urinaires, poss\u00e8de \u00e0 sa surface des \"poils\" appel\u00e9s fimbriae qui lui permettent de s'attacher pr\u00e9cis\u00e9ment \u00e0 ces r\u00e9cepteurs (en particulier l'uroplakine Ia) et m\u00eame de p\u00e9n\u00e9trer \u00e0 l'int\u00e9rieur des cellules uroth\u00e9liales. La muqueuse est \u00e9galement recouverte d'une couche de mucus, principalement constitu\u00e9e de sucres complexes appel\u00e9s glycosaminoglycanes (GAG), dont l'acide hyaluronique et le sulfate de chondro\u00eftine, qui la prot\u00e8gent des agressions physiques, chimiques ou biologiques et la rendent imperm\u00e9able.<\/p>\n<p>\u00a0Sous la muqueuse, et s\u00e9par\u00e9e d'elle par une fine couche appel\u00e9e membrane basale, sur laquelle reposent les cellules uroth\u00e9liales, se trouve la lamina propria, un tissu compos\u00e9 de diff\u00e9rents types de fibres (collag\u00e8ne, fibres \u00e9lastiques, etc.), de vaisseaux sanguins et lymphatiques, de terminaisons nerveuses, de certaines cellules de soutien comme les fibroblastes, les myofibroblastes ou les adipocytes (cellules adipeuses), et de cellules immunitaires.<\/p>\n<p>\u00a0La fonction de la sous-muqueuse est d'apporter un soutien structurel \u00e0 la muqueuse, ainsi que de fournir une d\u00e9fense immunitaire si n\u00e9cessaire, en renfor\u00e7ant la capacit\u00e9 de d\u00e9fense qui existe d\u00e9j\u00e0 dans l'uroth\u00e9lium. Le syst\u00e8me immunitaire r\u00e9sident de la vessie se compose principalement de cellules de l'immunit\u00e9 inn\u00e9e (cellules non sp\u00e9cialis\u00e9es, sans \"m\u00e9moire immunologique\"), essentiellement des mastocytes et des macrophages, ainsi que de quelques cellules tueuses naturelles (Nk).  Ces cellules, avec les immunoglobulines A s\u00e9cr\u00e9toires (les anticorps qui r\u00e9sident habituellement dans la muqueuse), les uroplakines, la couche de mucus et certaines substances bact\u00e9ricides s\u00e9cr\u00e9t\u00e9es dans l'urine par certaines cellules r\u00e9nales ou v\u00e9sicales (prot\u00e9ine de Tamm-Horsfall, \u03b2-d\u00e9fensine 1, NGAL, ribonucl\u00e9ase 7, cath\u00e9licidine, pentraxines, etc.)<strong>\u00a0<\/strong>\u00a0constituent la premi\u00e8re ligne de d\u00e9fense face aux\ninfections. Si la r\u00e9ponse immunitaire inn\u00e9e est activ\u00e9e par une infection, des cytokines seront lib\u00e9r\u00e9es par les cellules immunitaires et les cellules uroth\u00e9liales. Ces cytokines sont des substances qui servent \u00e0 \"appeler des renforts\", en recrutant d'autres cellules immunitaires pour aider \u00e0 renforcer la r\u00e9ponse immunitaire inn\u00e9e (neutrophiles, plus de macrophages, lymphocytes, etc.).<\/p>\n<p>\u00a0Apr\u00e8s la lamina propria, on trouve la muscularis propria, une couche de fibres musculaires dispos\u00e9es dans diff\u00e9rentes directions qui permettent de cr\u00e9er des mouvements dans ces organes, afin que l'urine puisse passer des reins \u00e0 la vessie et \u00eatre ensuite expuls\u00e9e par la vessie lors de la miction. Dans la vessie, ce muscle est appel\u00e9 d\u00e9trusor. Son fonctionnement est contr\u00f4l\u00e9 par le syst\u00e8me nerveux autonome (syst\u00e8mes sympathique et parasympathique), dont nous parlerons plus en d\u00e9tail dans un autre article. La couche musculaire, associ\u00e9e \u00e0 la couche sous-muqueuse et \u00e0 ses fibres \u00e9lastiques, conf\u00e8re \u00e0 la vessie une grande capacit\u00e9 de stockage d'environ un demi-litre d'urine, sans que la pression \u00e0 l'int\u00e9rieur de celle-ci n'augmente au repos. Ce m\u00e9canisme est tr\u00e8s important pour le bon fonctionnement de l'ensemble du syst\u00e8me urinaire, car une surpression dans la vessie pourrait \u00eatre transmise par voie r\u00e9trograde aux reins, ce qui entra\u00eenerait un dysfonctionnement r\u00e9nal, les reins devant toujours travailler \u00e0 basse pression. De m\u00eame, pendant la miction, lorsque le muscle de la vessie se contracte pour expulser l'urine et que la pression augmente fortement, la disposition particuli\u00e8re des fibres musculaires lisses \u00e0 l'embouchure des uret\u00e8res fonctionne comme une valve, emp\u00eachant la pression d'\u00eatre transmise aux reins.<strong>\u00a0<\/strong>\u00a0Si ce m\u00e9canisme de fermeture ne se fait pas correctement, il se produit une situation pathologique appel\u00e9e \"reflux v\u00e9sico-ur\u00e9t\u00e9ral\". D'autre part, il faut mentionner le m\u00e9canisme sphinct\u00e9rien de la vessie et de l'ur\u00e8tre, c'est-\u00e0-dire les muscles qui \"ferment\" l'extr\u00e9mit\u00e9 du syst\u00e8me excr\u00e9teur et emp\u00eachent l'urine de s'\u00e9chapper constamment vers l'ext\u00e9rieur.<strong>\u00a0<\/strong>\u00a0On peut consid\u00e9rer qu'il existe deux sphincters dans la vessie, le sphincter interne ou col v\u00e9sical et le sphincter externe ou sphincter stri\u00e9. Le sphincter interne n'est rien d'autre que le prolongement des fibres musculaires de la paroi v\u00e9sicale, qui deviennent circulaires au point de transition entre la vessie et l'ur\u00e8tre. Ainsi, lorsqu'elles se contractent, elles ferment la sortie de la vessie, tandis que lorsqu'elles s'ouvrent, la vessie prend la forme d'un entonnoir et l'urine peut passer. Le sphincter externe ne fait pas partie \u00e0 proprement parler du syst\u00e8me excr\u00e9teur urinaire, mais il y est \u00e9troitement li\u00e9. Il s'agit d'un muscle circulaire qui entoure l'ur\u00e8tre moyen chez la femme et l'ur\u00e8tre membraneux chez l'homme (la partie de l'ur\u00e8tre situ\u00e9e juste en dessous de la prostate). Ce muscle fait partie d'un groupe de muscles appel\u00e9 \"plancher pelvien\", dont la fonction est d'apporter un soutien anatomique et fonctionnel aux organes pelviens. La contraction du sphincter externe permet d'\u00e9trangler l'ur\u00e8tre et d'emp\u00eacher l'\u00e9coulement de l'urine. C'est ainsi, avec l'aide du sphincter interne, que l'on obtient une continence correcte. Contrairement au col de la vessie, dont le fonctionnement est r\u00e9gi par le syst\u00e8me nerveux autonome et que nous ne pouvons pas contr\u00f4ler volontairement, le sphincter externe fonctionne gr\u00e2ce aux fibres du nerf pudendal, qui appartient au syst\u00e8me nerveux \"volontaire\".<\/p>\n<p>\u00a0En poursuivant la structure en couches du syst\u00e8me excr\u00e9teur, nous trouvons la couche la plus externe, appel\u00e9e \"s\u00e9reuse\", compos\u00e9e principalement de tissu conjonctif. Cette couche ne recouvre pas la totalit\u00e9 de la surface externe des organes, mais leur fournit un support vasculaire en alimentant de nombreux vaisseaux sanguins. Dans les zones du syst\u00e8me excr\u00e9teur o\u00f9 il n'y a pas de s\u00e9reuse, on trouve une couche de tissu conjonctif l\u00e2che appel\u00e9e adventice, qui a la m\u00eame fonction.<\/p>\n<p><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-67a0e480a77206a1341e4e555813485e\"><em>Bibliographie :<\/em><\/p>\n<p><\/p>\n<p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cfea721 biblio elementor-widget elementor-widget-text-editor\" data-id=\"cfea721\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\" data-no-translation=\"\" data-no-auto-translation=\"\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Arponen S (2021). <em>Es la microbiota, idiota<\/em>. Alienta.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Godaly G, Ambite I, Svanborg C. Innate immunity and genetic determinants of urinary tract infection susceptibility. Curr Opin Infect Dis. 2015 Feb;28(1):88-96.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Lacerda Mariano L, Ingersoll MA. Bladder resident macrophages: Mucosal sentinels. Cell Immunol. 2018 Aug;330:136-141.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Song J, Abraham SN. TLR-mediated immune responses in the urinary tract. Curr Opin Microbiol. 2008 Feb;11(1):66-73.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Becknell B, Ching C, Spencer JD. The Responses of the Ribonuclease A Superfamily to Urinary Tract Infection. Front Immunol. 2019 Nov 29;10:2786.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Steigedal M, Marstad A, Haug M, Dam\u00e5s JK, Strong RK, et al. Lipocalin 2 imparts selective pressure on bacterial growth in the bladder and is elevated in women with urinary tract infection. J Immunol. 2014 Dec 15;193(12):6081-9.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Ueda N, Kondo M, Takezawa K, Kiuchi H, Sekii Y, et al. Bladder urothelium converts bacterial lipopolysaccharide information into neural signaling via an ATP-mediated pathway to enhance the micturition reflex for rapid defense. Sci Rep. 2020 Dec 3;10(1):21167.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Hayes BW, Abraham SN. Innate Immune Responses to Bladder Infection. Microbiol Spectr. 2016 Dec;4(6):10.1128\/microbiolspec.UTI-0024-2016.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">O\u2019Brien VP, Hannan TJ, Schaeffer AJ, Hultgren SJ. Are you experienced? Understanding bladder innate immunity in the context of recurrent urinary tract infection. Curr Opin Infect Dis. 2015 Feb;28(1):97-105.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Huang J, Fu L, Huang J, Zhao J, Zhang X, et al. Group 3 Innate Lymphoid Cells Protect the Host from the Uropathogenic Escherichia coli Infection in the Bladder. Adv Sci (Weinh). 2022 Feb;9(6):e2103303.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Wu J, Abraham SN. The Roles of T cells in Bladder Pathologies. Trends Immunol. 2021 Mar;42(3):248-260.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Billips BK, Schaeffer AJ, Klumpp DJ. Molecular basis of uropathogenic Escherichia coli evasion of the innate immune response in the bladder. Infect Immun. 2008 Sep;76(9):3891-900.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Nielsen KL, Stegger M, Kiil K, Godfrey PA, Feldgarden M, Lilje B, Andersen PS, Frimodt-M\u00f8ller N. Whole-genome comparison of urinary pathogenic Escherichia coli and faecal isolates of UTI patients and healthy controls. Int J Med Microbiol. 2017 Dec;307(8):497-507.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Ambite I, Butler D, Wan MLY, Rosenblad T, Tran TH, Chao SM, Svanborg C. Molecular determinants of disease severity in urinary tract infection. Nat Rev Urol. 2021 Aug;18(8):468-486.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Ziegler T, Jacobsohn N, F\u00fcnfst\u00fcck R. Correlation between blood group phenotype and virulence properties of Escherichia coli in patients with chronic urinary tract infection. Int J Antimicrob Agents. 2004 Sep;24 Suppl 1:S70-5.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Sulaiman KA, Al Qahtani N, Al Muqrin M, Al Dossari M, Al Wabel A, et al. The correlation between non-O blood group type and recurrent catheter-associated urinary tract infections in critically ill patients: A retrospective study. J Int Med Res. 2022 Jul;50(7):3000605221108082.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Albracht CD, Hreha TN, Hunstad DA. Sex effects in pyelonephritis. Pediatr Nephrol. 2021 Mar;36(3):507-515.\u00a0<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\",\"fontSize\":\"small\"} --><\/p>\n<p class=\"has-black-color has-text-color has-link-color has-small-font-size\">Wnorowska U, Piktel E, Deptu\u0142a P, Wollny T, Kr\u00f3l G, et al. Ceragenin CSA-13 displays high antibacterial efficiency in a mouse model of urinary tract infection. Sci Rep. 2022 Nov 10;12(1):19164.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>La structure et le fonctionnement du syst\u00e8me urinaire sont tr\u00e8s complexes. Je vais donc essayer d'expliquer de mani\u00e8re simple mais logique tout ce qui se passe autour du syst\u00e8me urinaire.<span class=\"excerpt-hellip\"> [...]<\/span><\/p>","protected":false},"author":1,"featured_media":1528,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1454","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-salud-urologica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comprender la estructura del\u00a0 sistema urinario | Urolistic<\/title>\n<meta name=\"description\" content=\"Redescubre el bienestar con Urolistic, el proyecto de la Dra. 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