{"id":32837,"date":"2021-08-26T14:55:59","date_gmt":"2021-08-26T12:55:59","guid":{"rendered":"https:\/\/www.staging12.lazeo.com\/traitements\/le-poil-et-son-cycle-de-vie\/"},"modified":"2021-12-15T11:31:30","modified_gmt":"2021-12-15T10:31:30","slug":"le-poil-et-son-cycle-de-vie","status":"publish","type":"traitements","link":"https:\/\/heuristic-chaum.217-154-146-230.plesk.page\/be-fr\/traitements\/microgreffe-f-u-e\/le-poil-et-son-cycle-de-vie\/","title":{"rendered":"Le poil et son cycle de vie"},"content":{"rendered":"\n
\n

Qui que nous soyons, homme, femme, jeune ou \u00e2g\u00e9, nous sommes tous plus ou moins recouverts de poils, de la t\u00eate au pieds. Aisselles, cuir chevelu, jambes, dos, visage, pubis ou bien bras, aucune zone de notre corps n\u2019est \u00e9pargn\u00e9e. Nous avons tous en commun des poils, mais leur cycle de vie varie selon plusieurs crit\u00e8res.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Mais tout d\u2019abord, qu\u2019est-ce-que le poil? (voir sch\u00e9ma)<\/h2>\n\n\n\n

C\u2019est dans cette bulle que se forme le bulbe, la base et la seule partie vivante du poil. En grandissant, la tige du poil sort de la peau, et c\u2019est la seule partie visible du poil dite k\u00e9ratinis\u00e9e.Le poil est une sorte de tige plus ou moins longue, dure et \u00e9paisse, selon la zone du corps et l\u2019individu, qui se cr\u00e9e dans une petite bulle sous la peau, qu\u2019on appelle le \u00ab follicule pileux \u00bb. <\/p>\n\n\n\n

Et quand est-il de son cycle de vie?<\/h3>\n\n\n\n

La glande s\u00e9bac\u00e9e d\u00e9termine la longueur, la dur\u00e9e du cycle de vie du poil (et du cheveu) et a aussi pour r\u00f4le de le prot\u00e9ger. Les hormones, facteur d\u00e9terminant, agissent sur cette glande et sur son taux de s\u00e9cr\u00e9tion de s\u00e9bum. Ainsi, plus il y a de s\u00e9bum s\u00e9cr\u00e9t\u00e9, plus le rythme du cycle s\u2019acc\u00e9l\u00e8re et plus courte est la vie du poil ou du cheveu.<\/p>\n\n\n\n

Le cycle du poil est influenc\u00e9 par plusieurs crit\u00e8res :<\/p>\n\n\n\n

  • la zone du corps<\/li>
  • le type et la nature du poil<\/li>
  • les caract\u00e9ristiques d\u2019une personne comme son \u00e2ge, son poids, son sexe, son m\u00e9tabolisme, ses origines, ses hormones\u2026<\/li><\/ul>\n\n\n\n

    Certains facteurs ext\u00e9rieurs influencent \u00e9galement son cycle comme les aliments que nous consommons, les m\u00e9dicaments que non prenons et l\u2019environnement dans lequel nous vivons.<\/p>\n\n\n\n

    \"\"<\/figure><\/div>\n\n\n\n

    Certes la dur\u00e9e du cycle du poil est diff\u00e9rent pour chacun, mais son syst\u00e8me chronologique, qui se divise en 3 phases, est le m\u00eame pour tous:<\/p>\n\n\n\n

    1. La phase anag\u00e8ne:<\/strong><\/em><\/p>\n\n\n\n

    C\u2019est la p\u00e9riode ultime de croissance du poil durant laquelle se d\u00e9termine sa pigmentation, et o\u00f9 \u00e0 un moment donn\u00e9 la concentration de m\u00e9lanine est \u00e0 son maximum. Cette phase perdure plusieurs ann\u00e9es et c\u2019est jusqu\u2019\u00e0 85% de nos poils qui se trouve dans cette phase, \u00e0 tout moment.<\/p>\n\n\n\n

    C\u2019est dans le bulge, zone sous cutan\u00e9e situ\u00e9e \u00e0 1,5 mm de profondeur, que vit la racine du poil et \u00e0 partir duquel il \u00e9volue.<\/p>\n\n\n\n

    Avant d\u2019entrer dans la phase catag\u00e8ne, le poil connait des perturbations, la papille se modifie progressivement et la production de m\u00e9lanine s\u2019arr\u00eate dans les zones germinatives.<\/p>\n\n\n\n

    2. La phase catag\u00e8ne:<\/strong><\/em><\/p>\n\n\n\n

    C\u2019est une p\u00e9riode de transition dans la vie du poil, appel\u00e9e aussi \u00e9tape de r\u00e9gression du poil, qui dure environ 2 semaines: le poil cesse de grandir. C\u2019est environ 3 \u00e0 4% de nos poils qui vit cette phase \u00e0 un moment donn\u00e9. <\/p>\n\n\n\n

    3. La phase t\u00e9log\u00e8ne:<\/strong><\/em><\/p>\n\n\n\n

    C\u2019est la r\u00e9elle phase de repos du poil qu\u2019on appelle \u00ab repos cellulaire \u00bb, qui dure entre 5 et 6 semaines, et qui pr\u00e9c\u00e8de la chute du poil. Cette phase repr\u00e9sente environ 13% des poils \u00e0 un moment donn\u00e9 de notre vie. Le poil cesse toute forme de croissance et tombe. Ainsi, son cycle de vie s\u2019ach\u00e8ve pour laisser place \u00e0 la pousse d\u2019un nouveau poil.<\/p>\n<\/div><\/div>\n\n\n\n

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