{"id":11956,"date":"2019-04-22T08:00:07","date_gmt":"2019-04-22T06:00:07","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=11956"},"modified":"2019-04-27T21:24:27","modified_gmt":"2019-04-27T19:24:27","slug":"semaine-17-2019","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-17-2019","title":{"rendered":"Semaine 17-2019"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Rien, ici-bas, n’est plus souple, moins r\u00e9sistant que l’eau, pourtant il n’est rien qui vienne mieux \u00e0 bout du dur et du fort.\u00a0\u00bb<\/p>\n

Lao-Tseu<\/p>\n

  <\/p>\n

Une image<\/h2>\n
\"Quel
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 de la semaine 17-2019 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x40 du microscope photonique.<\/p>\n

Elle comporte une structure centrale arqu\u00e9e, situ\u00e9e dans un espace semblant vide \u00e0 l’exception de petites unit\u00e9s dispers\u00e9es ou group\u00e9es localement en amas.<\/p>\n

  <\/p>\n

La structure arqu\u00e9e est constitu\u00e9e d’unit\u00e9s accol\u00e9es agenc\u00e9es en une couche, l\u00e9g\u00e8rement plus hautes que larges. Chacune contient une sous-unit\u00e9 circulaire ou ovale finement ponctu\u00e9e, entour\u00e9e d’un environnement finement granuleux. Dans la concavit\u00e9, de longues expansions ondul\u00e9es sont pr\u00e9sentes.<\/p>\n

Les unit\u00e9s ainsi d\u00e9crites correspondent \u00e0 des <\/a>cellules<\/a> animales, la sous-unit\u00e9 qu’elles contiennent \u00e9tant un noyau environn\u00e9 de cytoplasme<\/a> et les filaments qu’elles portent des cils<\/a>.<\/p>\n

L’ensemble constitue un \u00e9pith\u00e9lium<\/a> simple et prismatique, cili\u00e9. Sa courbure sugg\u00e8re qu’il d\u00e9limit\u00e9 une structure de forme conique.<\/p>\n

Sur la face convexe, une fine tunique fibreuse recouvre le c\u00f4ne. Elle est surmont\u00e9e d’une couche continue de cellules plates. Il s’agit de tissu conjonctif<\/a> fibreux sur lequel repose un \u00e9pith\u00e9lium simple et pavimenteux.<\/p>\n

L’espace apparemment vide est vraisemblablement une cavit\u00e9 liquidienne, et les unit\u00e9s qu’elle contient des cellules isol\u00e9es.<\/p>\n

  <\/p>\n

La pr\u00e9sence de vastes cavit\u00e9s liquidiennes dans lesquelles des cellules dispers\u00e9es et divers organes sont localis\u00e9s est caract\u00e9ristique des Ann\u00e9lides<\/a> comme le Lombric ou Ver de terre.<\/p>\n

Les cavit\u00e9s corporelles sont des cavit\u00e9s c\u0153lomiques<\/a>, d\u00e9limit\u00e9es par un \u00e9pith\u00e9lium c\u0153lomique et contenant des cellules appel\u00e9es c\u0153lomocytes.
\nIls sont d\u00e9crits respectivement dans les articles des semaines 41-2018<\/a>, 42-2018<\/a>, 43-2018<\/a>, 44-2018<\/a> et 37-2018<\/a>, 38-2018<\/a>, 39-2018<\/a>, 40-2018<\/a> de Codex virtualis.<\/p>\n

Parmi les organes pr\u00e9sents dans les cavit\u00e9s c\u0153lomiques figurent les organes excr\u00e9teurs, les m\u00e9tan\u00e9phridies.
\nIls comportent un pavillon cili\u00e9 en forme d’entonnoir, le n\u00e9phrostome, ouvert sur un tube n\u00e9phridien. Il met en communication la cavit\u00e9 c\u0153lomique et la lumi\u00e8re du tube n\u00e9phridien.
\nL’ensemble est recouvert par l’\u00e9pith\u00e9lium c\u0153lomique et du tissu conjonctif.<\/p>\n

Chez le Lombric, les d\u00e9chets du m\u00e9tabolisme sont notamment pris en charge par le sang. La filtration du sang \u00e0 travers la paroi des vaisseaux sanguins de la cavit\u00e9 c\u0153lomique conduit au transfert des d\u00e9chets vers le liquide c\u0153lomique. Les battements des cils du n\u00e9phrostome assurent leur entr\u00e9e dans la m\u00e9tan\u00e9phridie.<\/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>Goodrich E.S., 1932 \u2013 On the nephridiostome of Lumbricus.<\/a> Quarterly journal of microscopical science, 75 : 165-179 (adresse : http:\/\/jcs.biologists.org\/content\/joces\/s2-75\/297\/165.full.pdf)<\/p>\n

• <\/span>Heusser S., Dupuy H.G., 2015 \u2013 Atlas biologie animale. Dunod, 220p. Paris<\/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>Ramsay J.A., 1949 \u2013 The site of formation of hypotonic urine in the nephridium of Lumbricus<\/em><\/a>. Journal of experimental biology, 26 : 65-75 (adresse : http:\/\/jeb.biologists.org\/content\/jexbio\/26\/1\/65.full.pdf)<\/p>\n

  <\/p>\n

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

Une citation \u00ab\u00a0Rien, ici-bas, n’est plus souple, moins r\u00e9sistant que l’eau, pourtant il n’est rien qui vienne mieux \u00e0 bout du dur et du fort.\u00a0\u00bb Lao-Tseu   Une image   Voir l’image de plus grande taille   Voir l’image l\u00e9gend\u00e9e   L’image de la semaine 17-2019 r\u00e9sulte de l’observation d’une coupe histologique \u00e0 l’objectif x40 […]<\/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-11956","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\/11956","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=11956"}],"version-history":[{"count":11,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11956\/revisions"}],"predecessor-version":[{"id":11962,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/posts\/11956\/revisions\/11962"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=11956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/categories?post=11956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/tags?post=11956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}