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Skin and tissues (Skin Functions (Physical Barrier (water loss, injury,…

- - - - More superficial layers
      - Metastasis seldom occurs for above cancers
    - - Dangerous, usually begins as a mole
      - Metastasize thru the lymphoid system
    - - Most common form of skin cancer
      - Orginates in stratum germinativum
- - - - outermost later, keratinized tratified squamous ET
    - - Inner layer,keratiized epithelium, glandular epithelum, dense irregular CT, smooth muscle tissue, nervous tissue, blood vesels
    - - adipose tissue, distinct layer beneath skin, also called hypodermis
- - - - Structure - keratinized stratified squamous epithelium
    - - Stratum Corneum
        
        Outermost layer, composed of dead epithelial cells filled with the protein keratin
      - Stratum Lucidum
        
        Translucent layer cells separating, extra layer only in thick skin of soles & palms
      - Stratum Grandulosum
        
        Is composed of 3-5 layers of flattened grandular ells
      - Stratum spinosum
        
        Is composed of many layers of spiky cells with large nuclei
      - Stratum basale
        
        Innermost layer, directly above basement membrane, composed of a single row mitosing cuboidal epithelial cells and composed of melanocytes
    - - Determines skin color
      - Is produced by melanocytes in stratum basale
- - - - 2 distinct layers
        
        Papillary layer
        
        20% is below epidermis
        
        composed of loose areolar CT
        
        Surface forms dermal papillae that form fingerprints in thick skin
        
        Meissners Corpuscles for light touch
        
        Reticular Layer
        
        80% dense irregular CT
        
        Bundles of collagen fibers, elastic fibers, and reticular fibers which give skin its strngth and resiliency
        
        Pacinian corpuscles- sensory receptors for deep pressure
- - - - Adipose tissue & blood vessels
    - - insulation