{"id":11790,"date":"2019-02-11T08:00:11","date_gmt":"2019-02-11T07:00:11","guid":{"rendered":"https:\/\/codexvirtualis.fr\/codex\/?p=11790"},"modified":"2019-02-15T18:16:56","modified_gmt":"2019-02-15T17:16:56","slug":"semaine-07-2019","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-07-2019","title":{"rendered":"Semaine 07-2019"},"content":{"rendered":"

Une citation<\/h2>\n

\u00ab\u00a0Vivre en pleine conscience, ralentir son pas et go\u00fbter chaque respiration, cela suffit.\u00a0\u00bb<\/p>\n

Thich Nhat Hanh<\/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 07-2019 provient de l’observation d’une coupe histologique \u00e0 l’objectif x4 du microscope photonique.<\/p>\n

Elle appara\u00eet form\u00e9e de structures repli\u00e9es, rayonnant autour d’une \u00e9troite lumi\u00e8re. Elles sont surmont\u00e9es d’un massif compact entour\u00e9 d’un espace semblant vide.<\/p>\n

  <\/p>\n

Les structures repli\u00e9es poss\u00e8dent une paroi form\u00e9e d’une fine couche p\u00e9riph\u00e9rique et continue, ainsi que de multiples unit\u00e9s filamenteuses, poss\u00e9dant une extr\u00e9mit\u00e9 sombre et un prolongement plus clair, situ\u00e9es dans leur lumi\u00e8re.<\/p>\n

Les lumi\u00e8res des structures repli\u00e9es sont en continuit\u00e9 avec une lumi\u00e8re occup\u00e9e par des unit\u00e9s filamenteuses plus discr\u00e8tes. Sa paroi est continue et \u00e9paisse, bord\u00e9e d’un liser\u00e9 stri\u00e9.<\/p>\n

La masse compacte surmontant cet ensemble est constitu\u00e9e d’amas ovales ou circulaires juxtapos\u00e9s.<\/p>\n

  <\/p>\n

Les parois ainsi d\u00e9crites sont principalement form\u00e9es de tissus <\/a>\u00e9pith\u00e9liaux<\/a> de rev\u00eatement, simples et cubiques \u00e0 prismatiques. Ils comportent vraisemblablement une ciliature<\/a> apicale, au contact de la lumi\u00e8re.<\/p>\n

Les structures repli\u00e9es constituent des sortes d’entonnoirs ouverts sur une cavit\u00e9 corporelle et convergeant vers un conduit. Ils recueillent les unit\u00e9s filamenteuses produites dans la cavit\u00e9 et les transf\u00e8rent dans le canal auquel ils sont reli\u00e9s.<\/p>\n

  <\/p>\n

Les unit\u00e9s filamenteuses sont vraisemblablement des spermatozo\u00efdes<\/a>, fins et longs, dont la t\u00eate est repr\u00e9sent\u00e9e par la r\u00e9gion sombre et le flagelle<\/a> par la r\u00e9gion claire.<\/p>\n

Ils sont form\u00e9s dans la masse compacte, localis\u00e9e dans une cavit\u00e9 corporelle liquidienne, puis pris en charge par un entonnoir et un canal correspondant \u00e0 un spermiducte.<\/p>\n

Un tel agencement est rencontr\u00e9 dans le cas des Ann\u00e9lides<\/a>, et en particulier du Lombric : les v\u00e9sicules s\u00e9minales, zones sp\u00e9cialis\u00e9es des cavit\u00e9s c\u0153lomiques<\/a> des segments 10 et 11, assurent la formation des spermatozo\u00efdes par \u00e9volution des spermatogonies<\/a> form\u00e9es dans les testicules, puis leur transfert aux spermiductes gr\u00e2ce \u00e0 un pavillon cili\u00e9.<\/p>\n

Les spermiductes acheminent ensuite les spermatozo\u00efdes vers les orifices g\u00e9nitaux<\/a>.<\/p>\n

  <\/p>\n

L’organisation de l’appareil<\/a> g\u00e9nital m\u00e2le du Lombric auquel appartiennent ces structures est d\u00e9crite dans l’article de la semaine 51-2018<\/a> de Codex virtualis.<\/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>Calkins G. N., 1895 – The spermatogenesis of Lumbricus.<\/a> Journal of morphology, 11, 2 : 271-302 (adresse : https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/jmor.1050110203)
\nDOI : 10.1002\/jmor.1050110203<\/a><\/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

  <\/p>\n

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

Une citation \u00ab\u00a0Vivre en pleine conscience, ralentir son pas et go\u00fbter chaque respiration, cela suffit.\u00a0\u00bb Thich Nhat Hanh   Une image   Voir l’image de plus grande taille   Voir l’image l\u00e9gend\u00e9e   L’image de la semaine 07-2019 provient de l’observation d’une coupe histologique \u00e0 l’objectif x4 du microscope photonique. Elle appara\u00eet form\u00e9e de structures […]<\/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":[47,14,23,22],"class_list":["post-11790","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-annelide","tag-histologie","tag-observation","tag-physiologie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t