![\"Quel](\"\/documents\/images\/histologie_articles\/compartiments_liquidiens\/lombric_vaisseau_01-WEB.jpg\")
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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 de la semaine 48-2018 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x100 du microscope photonique.<\/p>\n Le centre est occup\u00e9 par une structure de forme ovale, poss\u00e9dant une paroi composite qui d\u00e9limite une lumi\u00e8re dans laquelle des amas sont pr\u00e9sents. Elle est entour\u00e9e d’espaces semblant vides, contenant toutefois des unit\u00e9s isol\u00e9es. <\/p>\n Les amas de la lumi\u00e8re du tube comme les unit\u00e9s isol\u00e9es des espaces alentour comportent une sous-unit\u00e9 ovale, sombre et ponctu\u00e9e, baignant dans un environnement homog\u00e8ne ou granuleux. <\/p>\n De la lumi\u00e8re vers la p\u00e9riph\u00e9rie, la paroi de la structure tubuleuse appara\u00eet constitu\u00e9e :<\/p>\n • <\/span>d’une tunique de cellules de petite taille et isol\u00e9es, formant un rev\u00eatement discontinu ;<\/p>\n • <\/span>d’une couche fibreuse dense, l\u00e9g\u00e8rement ondul\u00e9e et continue ;<\/p>\n • <\/span>d’une assise circulaire, homog\u00e8ne et peu \u00e9paisse ;<\/p>\n • <\/span>d’une enveloppe fibreuse peu dense ;<\/p>\n • <\/span>d’une couche continue de grandes cellules plates \u00e0 noyau plat.<\/p>\n Les constituants ainsi d\u00e9crits sont vraisemblablement et respectivement un r\u00e9seau de cellules bordant la lumi\u00e8re, du tissu conjonctif<\/a> fibreux dense, des fibres musculaires lisses \u00e0 disposition circulaire, du tissu conjonctif fibreux l\u00e2che et un \u00e9pith\u00e9lium<\/a> simple pavimenteux. <\/p>\n <\/p>\n Un tel agencement est sp\u00e9cifique de la paroi des vaisseaux sanguins des Ann\u00e9lides<\/a> comme le Lombric, ou Ver de terre. Il est illustr\u00e9 par la structure du vaisseau sanguin dorsal<\/a> du Lombric, qui a fait l’objet des articles des semaines 46-2018<\/a> et 47-2018<\/a> de Codex virtualis.<\/p>\n En l’occurrence, l’image de la semaine 48-2018 repr\u00e9sente un vaisseau sanguin associ\u00e9 \u00e0 une m\u00e9tan\u00e9phridie, organe excr\u00e9teur du Lombric, dans lequel des h\u00e9mocytes sont pr\u00e9sents. Les m\u00e9tan\u00e9phridies assurent la production de l’urine \u00e0 partir du liquide c\u0153lomique, son acheminement et son \u00e9vacuation dans le milieu par un pore ventral appel\u00e9 n\u00e9phridiopore. De forme tubuleuse, elles sont responsables de la modification de la composition de l’urine au cours de son transit, r\u00e9alisant des \u00e9changes avec le liquide sanguin des vaisseaux qui leur sont associ\u00e9s. Elles sont ainsi le si\u00e8ge de r\u00e9absorptions et de s\u00e9cr\u00e9tions s\u00e9lectives. <\/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>Hanson J., 1949 – The histology of the blood system in Ologochaeta and Polychaeta.<\/a> Biological reviews of Cambridge philosophical society, 24, 2 : 127-173 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1111\/j.1469-185X.1949.tb00573.x) • <\/span>Hartenstein V., Mandal L., 2006 – The blood\/vascular system in a phylogenetic perspective.<\/a> BioEssays, 28, 12 : 1203-1210 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/bies.20497) • <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/p>\n • <\/span>Johnston J.B., 1903 – On the blood vessels, their valves and the course of the blood in Lumbricus.<\/a> Biological Bulletin, 5, 2 : 74-84 (adresse : https:\/\/www.jstor.org\/stable\/1535513)<\/p>\n • <\/span>Leake L. D., 1975 \u2013 Comparative histology, an introduction to the microscopic structure of animals. Academic press, 738p. London, New York, San Francisco<\/p>\n • <\/span>Mu\u00f1oz\u2010Ch\u00e1puli R., Carmona R., Guadix J.A., Mac\u00edas D., P\u00e9rez\u2010Pomares J.M., 2005 – The origin of the endothelial cells: an evo\u2010devo approach for the invertebrate\/vertebrate transition of the circulatory system.<\/a> Evolution & Development, 7, 4 : 351-358 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1111\/j.1525-142X.2005.05040.x) <\/p>\n Une citation \u00ab\u00a0Ne parlez pas d’une chose que vous ne voudrez pas avoir dite le lendemain.\u00a0\u00bb Proverbe arabe Une image Voir l’image de plus grande taille Voir l’image l\u00e9gend\u00e9e L’image de la semaine 48-2018 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x100 du microscope photonique. Le centre est occup\u00e9 par […]<\/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":""},"categories":[1],"tags":[47,14,23,22],"class_list":["post-11569","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-annelide","tag-histologie","tag-observation","tag-physiologie"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/comments?post=11569"}],"version-history":[{"count":15,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11569\/revisions"}],"predecessor-version":[{"id":11571,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11569\/revisions\/11571"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=11569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=11569"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=11569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nIl s’agit vraisemblablement d’une structure tubuleuse coup\u00e9e transversalement.<\/p>\n
\nUne telle organisation est caract\u00e9ristique des <\/a>cellules<\/a> animales, la sous-unit\u00e9 ovale correspondant au noyau et son environnement au cytoplasme<\/a>.<\/p>\n
\nLes vaisseaux sanguins associ\u00e9s aux m\u00e9tan\u00e9phridies proviennent de ramifications du vaisseau sanguin ventral et rejoignent des vaisseaux sanguins pari\u00e9taux acheminant le sang vers le vaisseau dorsal. Ils baignent dans les cavit\u00e9s c\u0153lomiques<\/a> et sont entour\u00e9s d’\u00e9pith\u00e9lium c\u0153lomique surmontant du tissu conjonctif fibreux.<\/p>\n
\nDOI : 10.1111\/j.1469-185X.1949.tb00573.x<\/a><\/p>\n
\nDOI : 10.1002\/bies.20497<\/a><\/p>\n
\nDOI : 10.1111\/j.1525-142X.2005.05040.x<\/a><\/p>\n
\n","protected":false},"excerpt":{"rendered":"