integumentary

• integument (skin)


  external covering / protective layer
• why no hair on palms?

  sebaceous glands
• avascular part of skin


  epidermis
• corneum


  uppermost layer / composed of dead squamous cells / horny layer
• lucidum


  clear layer
• granulosm 


  cytoplasm filled with granules / barrier / where keratinization begins
• spinosum


  boundary between dead and alive cells / pricky layer
• germinativum / basale


  composed of cuboidal and columnar cells
• cell regeneration

  mitotic divisions every 19 days
• keratinization


  movement of cells from bottom to top
• callus 


  thickened area
• corn 


  cone-shaped structure
• melanin


  pigment responsible for color
• melanocytes


  produces melanin
• PARTS OF SKIN (CLGSG)

  corneum

  lucidum

  granulosum

  spinosum

  germinativum / basale