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A&P CH 5 - Coggle Diagram

- - - - superficial layer of skin
      - stratified squamous epithelial tissue
      - protects against skin abrasion
      - separated from the dermis by basement membrane
      - no blood vessels no nerve endings
      - thinner than the dermis
      - mostly made of keratinocytes
        
        also made of melanocytes, Langerhans cells, Merkel cells
        
        melanocytes = pigment production
        
        Langerhans cells = immune cells
        
        Merkel cells = associated with nerve endings, responsible for detection of outside environment
      - 5 layers/strata
        
        stratum basale (deepest layer)
        
        anchored to basement membrane by hemidesmosomes
        
        desmosomes hold keratinocytes together and together they provide strength to the epidermis
        
        mitotic division every 19 days then it takes 40-56 days to be shed
        
        stratum spinosum
        
        8-10 layers
        
        spikey under a microscope
        
        lamellar bodies form here
        
        stratum granulosum
        
        2-5 layers
        
        flat, diamond shaped cells
        
        keratohyalin
        
        stratum lucidum
        
        thin and clear
        
        only present in some areas
        
        stratum corneum (superficial layer)
        
        25+ layers
    - - dense irregular connective tissue
      - provides strength to the skin
    - - connects skin to muscle and bone
  - - - pigments
        
        melanin causes skin, hair, and eye color
      - blood circulation
      - thickness of stratum corneum