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Anatomie

Aurélie

Created on January 23, 2026

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1. Le film lacrymal

Le film lacrymal est la couche liquide qui recouvre et separe la surface cornéenne de l'air Il est essentiel pour la transparence, la lubrification et la protection de la cornée. il se compose de trois couches principales.

Une couche lipidique

Sécrétée par les glandes de meibomius,elle est divisée en 2 phases Phase non polaire, externe (cires, triglycérides, esters de cholestérol) Rôle : limite l’évaporation, facilite le clignement, protège la surface oculaire Phase polaire, interne (phospholipides, glycolipides) Rôle : interface avec la phase aqueuse, stabilise le film lacrymalus

Une couche acqueuse

Sécrétée par la glande lacrymale principale et les glandes accessoires (Krause et Wolfring) Composition : eau, électrolytes, protéines Rôle : hydratation, nutrition, protection immunologique, élimination des débris

Une couche mucinique

0,5 µm environ Sécrétée par les cellules caliciformes de la conjonctive Composition : mucines (MUC5AC) Rôle : rend la surface cornéenne hydrophile, permet l’adhésion de la phase aqueuse à la cornée et l’uniformité du film

2. L'épithelium

Sous le film lacrymal, l'épithélium est la couche la plus superficielle de la cornée. Il constitue la première barrière de protection de l’œil et participe directement à la qualité optique.

Épaisseur moyenne : ≈ 50 µm Représente environ 10 % de l’épaisseur totale de la cornée Renouvellement rapide : entre 7 à 21 jours, confluence 48 à 72 heures

Les différentes couches de l'épithélium

🔹 Couche superficielle Couche protectrice Forme la barrière externe et assure une surface optique lisse. 🔹 Couche intermédiaire Couche de transition Assure la cohésion et la différenciation cellulaire. 🔹 Couche basale →Couche régénératrice Assure le renouvellement et l’ancrage à la couche basale

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La couche de Bowman

Epaisseur : ≈ 12 µm • Zone acellulaire composée de fibrilles de collagène entrelacées et nerfs enchevétrés • Située sous la membrane basale de l’épithélium • Contribue à la fixation de l’épithélium (ancrage via la membrane basale et les hémidesmosomes) • Zone de transition vers le stroma • Limite stromale non nettement individualisable

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THANKS!

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