Summary
Samenvatting Medische Biologie Hoofdstuk Huid
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- Institution
Dit document heeft de aantekeningen van het hoorcollege en samenvatting van het boek hoofdstuk huid.
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Hoorcollege MB 6.5 De huidFuncties van de huid:
1. Bescherming
2. Temperatuurregeling
3. Vorming (Vitamine D) en opslag (vetten) van voedingsstoffen
4. Zintuiglijke gewaarwording
5. Uitscheiding
Bv. Afvalstoffen
Drie huidlagen
Epidermis: Opperhuid: Dode-cellen
Dermis: Lederhuid: talgklieren en bloedvaten
Subcutis/hypodermis: Onderhuids bindweefsel: Vetcellen en grote bloedvaten
1. Epidermis; opperhuid
- Is niet doorbloed, dus…
Krijgt voedingsstoffen en zuurstof van de dermis en voert afvalstoffen via de dermis af.
· Geen lymfevaten
· Levende kiemlaag; veel (eiwit)transsport
Lagen in de epidermis
1. Stratum basale (kiemlaag)
o Kubische cellen op basaalmembraan Melanocyten
o Stamcellen: huid vernieuwd
2. Stratum spinosum (stekellaag)
o Tevens celdeling d.m.v. stamcellen
o Stevigheid
3. Stratum granulosum (korrellaag)
o Geen celdeling meer
o Doorzichtige korrels maken keratine
4. Stratum lucidum (heldere laag)
o Vrijwel platte cellen Keratine
5. Stratum corneum: (bovenste huidlaag)
o Meest oppervlakkige laag
o Dode cellen met veel keratine: eiwit: stevigheid en bescherming: eelt
o Stevigheid
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