Zusammenfassung der Ressource
Layers of the Epidermis
- Stratum Corneum (20-25 layers)
- Layers of keratinocytes
- Containment
- Water protection
- 28 day cycle
- 14 to reach SC
- 14 to be shed
- No nucleus
- Squaemous Epithelium
- Stratum Granulosum
- Contains increasingly kertainised cells
- Keratin organises into fibres
- Lamellar granules produce lipid 'glue
- Some undergo apoptosis
- They're too far from a nutrient source
- Nuclei being to disintegrate
- Stratum Basale
- Basal Cells
- Rapidly dividing
- Keratinocytes
- Merkel Cell
- Associated with sensory nerves
- Shapes/textures
- Found at bottom of sweat duct
- Melanocytes
- 8-10% of stratum basale
- Produce melanosomes
- Apoptosis of these cells under UV causes sunburn
- Stratum Spinosum
- Adjacted cells bonded by desmosomes
- Coarser keratin than in the stratum basalum
- Limited ability to divide
- Langerhans Cell
- Presents antigens of taken up microbes
- So T-cells will recognize them