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Les deux hormones qui r\u00e9gulent ce processus sont les suivantes :<\/p> <p>L\u2019hormone folliculostimulante (ci-apr\u00e8s FSH)<\/p> <p>L\u2019hormone lut\u00e9inisante (ci-apr\u00e8s LH)<\/p> <p>Le mode de lib\u00e9ration de ces hormones permet de diviser le cycle menstruel en trois phases :<\/p> <p><!--more--><\/p> <h2 class=\"font-bold font-sans text-black text-2xl lg:text-3xl leading-tight\">Phase folliculaire :<\/h2> <p>Elle commence le 1er jour du cycle menstruel ou, ce qui revient au m\u00eame, le premier jour du saignement menstruel. L\u2019hormone FSH commence par stimuler le d\u00e9veloppement de plusieurs follicules mais, \u00e9tant donn\u00e9 que les taux de FSH diminuent progressivement lors d\u2019un cycle naturel, seul un follicule sera dominant et produira un ovule mature. Les follicules non dominants seront absorb\u00e9s par l\u2019ovaire et ne pourront pas \u00eatre r\u00e9utilis\u00e9s lors des cycles post\u00e9rieurs (autrement dit, ils sont perdus). D\u2019autre part, le follicule en d\u00e9veloppement va s\u00e9cr\u00e9ter ensuite des \u0153strog\u00e8nes qui auront, entre autres, la fonction de contribuer aux modifications n\u00e9cessaires du mucus cervical afin d\u2019aider les spermatozo\u00efdes \u00e0 passer dans l\u2019ut\u00e9rus ou encore de provoquer l\u2019\u00e9paississement n\u00e9cessaire de l\u2019endom\u00e8tre pour que l\u2019embryon puisse s\u2019y implanter. L\u2019\u0153strog\u00e8ne principal produit par l\u2019ovaire est l\u2019\u0153stradiol (E2).<\/p> <h2 class=\"font-bold font-sans text-black text-2xl lg:text-3xl leading-tight\">\u00a0<\/h2> <h2 class=\"font-bold font-sans text-black text-2xl lg:text-3xl leading-tight\">Phase ovulatoire :<\/h2> <p>Il s\u2019agit d\u2019une phase de courte dur\u00e9e. Elle d\u00e9bute lorsque, en r\u00e9ponse \u00e0 l\u2019augmentation des taux d\u2019\u0153strog\u00e8nes, le taux de LH augmente de fa\u00e7on spectaculaire. Ce pic de LH entra\u00eene la maturation finale de l\u2019ovule, la rupture du follicule et la lib\u00e9ration de l\u2019ovule. Cette phase se d\u00e9roule normalement 14 jours avant la menstruation suivante ou, ce qui revient au m\u00eame, le 14e jour d\u2019un cycle de 28 jours.<\/p> <h2 class=\"font-bold font-sans text-black text-2xl lg:text-3xl leading-tight\">\u00a0<\/h2> <h2 class=\"font-bold font-sans text-black text-2xl lg:text-3xl leading-tight\">Phase lut\u00e9ale : Elle d\u00e9bute apr\u00e8s l\u2019ovulation.<\/h2> <p>Arriv\u00e9 \u00e0 ce point, le follicule ovarien qui a lib\u00e9r\u00e9 l\u2019ovule au cours de la phase pr\u00e9c\u00e9dente se paralyse et se solidifie pour se transformer en ce que l\u2019on appelle le corps lut\u00e9al. Cette structure est tr\u00e8s importante car elle produit la progest\u00e9rone, autrement dit, l\u2019hormone charg\u00e9e de transformer et de pr\u00e9parer l\u2019endom\u00e8tre de mani\u00e8re \u00e0 ce qu\u2019un ovule f\u00e9cond\u00e9 (le pr\u00e9-embryon) puisse s\u2019y implanter et s\u2019y d\u00e9velopper. En l\u2019absence de conception, le corps lut\u00e9al cesse de fonctionner aux environs du 26e jour du cycle (pour un cycle de 28 jours). Sans le soutien de la progest\u00e9rone, l\u2019endom\u00e8tre commence \u00e0 se d\u00e9composer et est \u00e9limin\u00e9 lors de la menstruation.<\/p>","protected":false},"excerpt":{"rendered":"<p>Le cycle menstruel et l\u2019ovulation La glande pituitaire du cerveau est charg\u00e9e de produire et de doser les hormones de&#8230;<\/p>\n","protected":false},"author":11,"featured_media":11505,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-11504","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classifiee"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le cycle menstruel et l\u2019ovulation | Ginefiv Espa\u00f1a<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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