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Cutaneous Layer - Coggle Diagram
Cutaneous Layer
Epidermis (Epithelial Layer
Avascular: depends on dermis for nutrition
No lymphatic network
0,08mm -4.0cm thick
Replaces every 4-6 weeks
rests on dermis
Basal layer and prickle cel layers are responsible for regenaration of cells.
new cellls migrate through the 5 epithelial layers in 14 to 21 days.
Desquamate (cells that fall off. or senesence cells) in the horny layer as old cells
stratum basale
produce and store melanin (exposure to sun stimulates melanocytes)
Stratum spinosum
contain keratinocytes and langerhans cells
looks like tiny pincushions: shrinkage of the cytoplasm
stratum granulosum
keratinocytes and langerhans cells
stratum lucidium: transparent on palms and soles of feet. Protects body and controlls fluid loss.
stratum cornneum - keratin filaments and it is a flat cell.
callusses , build up of stratum corneum.
non permiable layer
prevents micro-organisms
Water resistant
gases and fat solubles substances can penetrate the corneum
Subcutaneous tissue
stores energy
ensure thermal insulation
molds body contours
protects underlying organs
full thickness burns stage 3 pressure sores extend into this layer
Dermis, Connective tissues supported by the subcutaneous tissue.
Papillary layer
characterised by papillae that extend between the the reticular layer and the stratum basale
fingerprints
helps to grip
sensory nerves
sensitive to touch and temperature
involved in secondary burns (superficial burns)
Reticular layer
bundles of collagen fibres
superficial burns
supports connection to underlying structures
0,5 -3 mm thick
dermal cells
fibroblasts
fibres give the skin tensile strength
Mast cells
macrophages
macrophages and white blood cells help fight infection
secretes platelet derived growth factor
conductor of healing