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samenvatting epithelen

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Samenvatting o.b.v. het hoofdstuk epithelen in het boek functionele histologie en de cursus.

Institution
Universiteit Antwerpen (UA)
Course
Histologie








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Connected book

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L.C. Junqueira, J. Carneiro Functionele histologie
  • september 2007
  • 9789035228627
  • 11

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Institution
Universiteit Antwerpen (UA)
Study
Biomedische Wetenschappen
Course
Histologie
All documents for this subject (121)

Document information

Summarized whole book?
No
Which chapters are summarized?
Hoofdstuk epithelen
Uploaded on
May 14, 2021
Number of pages
14
Written in
2020/2021
Type
Summary

Subjects

  • epitheel

Content preview

Histologie: epithelen
Algemeen
 Beschermen van onderliggende weefsel
o Bedekken lichaamsppervlak
o Lijnen lichaamsholgen en kanalen af
 Regulatie van opname en afgifte van stoffen
 Vormt klieren (klierepitheel)
 Gespecialisserde epitheliale weefsels
 Bestaan uit 1 of meer lagen van epitheelcellen
 Cellen sluiten nauw aaneen
 Zeer weinig extracellulaire matrix (LM: dicht opeengeplakte cellen, EM: nauwe spleten)
 Cellen zijn verbonden met elkaar door intercellulaire verbindingen
 Basaalmembraan = afgrenzing van onderliggende bindweefsellaag
 Bevat GEEN bloedvaten


Bloedvoorziening
Bloedvaten dringen nooit binnen in epitheel weefsel
-> epitheel is dus afhankelijk van diffusie van zuurstof en VS van onderliggende weefsels

Epitheelcel
Cytoskelet van epitheelcel bestaat uit keratine

KERATINE
 Keratine-eiwitten worden in alle epitheelcellen geproduceerd
 Specifiek type keratine in specifieke epitheelcel
 Kunnen keratine-filamenten vormen (invermediaire filamenten)
 Belangrijk voor keratinisering en verhoorning

CELPOLARITEIT
=> epitheelcellen zijn gepolariseerd: apicale, basale, laterale domeinen zijn functioneel verschillend
Epitheel gesteund door onderliggend basaalmembraan




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