{"id":9505,"date":"2017-01-30T08:00:30","date_gmt":"2017-01-30T07:00:30","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=9505"},"modified":"2017-04-05T22:15:56","modified_gmt":"2017-04-05T20:15:56","slug":"semaine-05-2017","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-05-2017","title":{"rendered":"Semaine 05-2017"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Nous voyons les choses non pas telles qu’elles sont mais telles que nous sommes.\u00a0\u00bb<\/p>\n

E. Kant<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Quel<\/a>
Quel est cet organe ?<\/figcaption><\/figure>\n

  <\/p>\n

Voir l’image de plus grande taille<\/a><\/p>\n

  <\/p>\n

Voir l’image l\u00e9gend\u00e9e<\/a><\/p>\n

  <\/p>\n

L’image propos\u00e9e repr\u00e9sente une section d’organe observ\u00e9e au microscope photonique au grossissement x400.<\/p>\n

De forme ovale ou circulaire en coupe transversale, l’organe est creux et d\u00e9limit\u00e9 par une paroi.<\/p>\n

  <\/p>\n

La paroi a une \u00e9paisseur tr\u00e8s inf\u00e9rieure \u00e0 la valeur du rayon de la lumi\u00e8re.<\/p>\n

Elle est constitu\u00e9e du centre vers la p\u00e9riph\u00e9rie :<\/p>\n

• <\/span>d’une assise continue de cellules plates, correspondant \u00e0 un \u00e9pith\u00e9lium<\/a> ;<\/p>\n

• <\/span> d’une fine tunique associant fibres musculaires lisses et de tissu conjonctif<\/a> fibreux ;<\/p>\n

• <\/span> d’une \u00e9paisse couche de tissu conjonctif fibreux, continue avec celle de l’environnement.<\/p>\n

  <\/p>\n

Cet agencement est caract\u00e9ristique des veines<\/a> de diam\u00e8tre important, tissulaires ou libres, responsables du drainage du sang des organes comme le c\u00f4lon.<\/p>\n

Elles poss\u00e8dent une paroi form\u00e9e de trois tuniques concentriques :<\/p>\n

• <\/span>une intima, au contact du sang, repr\u00e9sent\u00e9e par un endoth\u00e9lium<\/a>, \u00e9pith\u00e9lium simple et pavimenteux, reposant sur une fine couche conjonctive sous-endoth\u00e9liale ;<\/p>\n

• <\/span>une m\u00e9dia, entourant l’intima, et form\u00e9e de quelques fibres musculaires lisses circulaires baign\u00e9es dans un tissu conjonctif fibreux abondant ;<\/p>\n

• <\/span>une adventice externe, \u00e9paisse et de nature conjonctive, fusionn\u00e9e avec le tissu conjonctif de l’organe irrigu\u00e9.<\/p>\n

  <\/p>\n

En relation avec la structure de leur paroi, les veines ont la capacit\u00e9 de se dilater et de contenir une importante quantit\u00e9 de sang.<\/p>\n

  <\/p>\n

Pour en savoir plus, consulter :<\/p>\n

• <\/span>les pages Premiers pas histologiques<\/a> de Codex virtualis (adresse : http:\/\/codexvirtualis.fr\/codex\/de-lorganisation-interne\/premiers-pas-histologiques)<\/p>\n

• <\/span>Burkitt H.G., Young B., Heath J.W., 1993 \u2013 Histologie fonctionnelle Wheater. Arnette, 408p. Paris<\/p>\n

• <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/p>\n

  <\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Une citation \u00ab\u00a0Nous voyons les choses non pas telles qu’elles sont mais telles que nous sommes.\u00a0\u00bb E. Kant   Une image   Voir l’image de plus grande taille   Voir l’image l\u00e9gend\u00e9e   L’image propos\u00e9e repr\u00e9sente une section d’organe observ\u00e9e au microscope photonique au grossissement x400. De forme ovale ou circulaire en coupe transversale, l’organe […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[54,14,29,23],"class_list":["post-9505","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-circulation","tag-histologie","tag-mammifere","tag-observation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t