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Samenvatting anatomie & fysiologie 1, hoofdstuk 5: de huid
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Samenvatting van het boek 'anatomie en fysiologie - 8ste editie'. Samenvatting van hoofdstuk 5: de huid. Vives Roeselare, Brugge & Kortrijk.
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Anatomie & fysiologie5. De huid
5.1. Functies
1. Bescherming
2. Temperatuurregeling
3. Vorming & opslag voedingsstoffen
4. Zintuigelijke waarneming
5. Uitscheiding & afscheiding
3 huidlagen:
1. Epidermis (opperhuid)
2. Dermis (lederhuid)
3. Hypodermis (onderhuid of subcutis)
Epidermis -> gelaagd plaveiselepitheel
Dermis -> bindweefsel
Hypodermis -> losmazig bindweefsel
5.2. Epidermis
Vormt epidermiskammen = strekt zich uit in dermis en grenst aan huidpapillen die in de epidermis uitsteken
5 lagen:
Stratum corneum Afgevlakte, dode keratinocyten
(hoornlaag) Waterbestendig, maar niet waterdicht
Stratum lucidum Glasachtige laag
(heldere laag) Alleen in dikke huid (bv. voetzool)
Stratum granulosum Keratinocyten vormen keratine (hoornstof)
(korrellaag) Keratinevezels ontwikkelen zich naarmate
cellen dunner en vlakker worden
Geleidelijk aan verdikken
plasmamembranen, de organellen vallen
uiteen en cellen sterven af
Stratum spinosum Keratinocyten zijn onderling door
(stekellaag) desmosomen verbonden
Stratum basale Diepste, basale laag
(basaalcellenlaag) Hechting aan basaal membraan
Bevat basale (stamcellen), melanocyten &
tastcellen (merkelcellen)
Vormt epidermiskammen
Dikke huid -> 5 lagen dunne huid: 4 lagen (geen stratum lucidum)
Vingerafdrukken laten het patroon van epidermiskammen zien
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