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La composition de la peau
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Voici une description simple de la composition de la peau humaine
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La peauLa peau constitue l’organe le plus grand du corps humain : elle représente 16 % de son poids total.
Elle est composée de plusieurs couches de tissus, la spécialité médicale traitant de la peau et de ses
affections est la dermatologie.
C’est l’organe le plus étendu, la superficie de la peau est d’environ 4m2 chez un adulte, et le plus
lourd, elle pèse en moyenne 4kg et a une épaisseur de 2 mm en moyenne.
Elle est renouvelée environ tous les 21 jours. Elle compte énormément de terminaisons nerveuses
qui permettent le sens du toucher.
D’un point de vue chimique, la peau comprend en moyenne :
• 70% d'eau
• 27,5% de protéine
• 2% de matières grasses
• 0,5% de sels minéraux et oligo-éléments
Elle est constituée de trois couches de tissus :
• L’épiderme, la couche superficielle
• Le derme, couche intermédiaire
• L’hypoderme, couche profonde
Schéma de la peau
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