Summary: Integumentary System

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  • 1 Integumentary System

  • What are the functions of the Integumentary System?

    Protection, thermoregulation, sensory reception, and synthesis of vitamin D.
  • 1.1 Epidermis

  • What are the five layers of the epidermis (from deep to superficial)?

    Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), stratum corneum.
  • What happens in the stratum basale?

    Continuous cell division occurs, which produces all the other layers
  • What characterizes the stratum spinosum?

    They have keratinocytes on them, which makes the cells appear to have little spines.
  • What happens in the stratum coroneum?

    Dead keratinocytes that are continually shedding and that are replaced by cells from deeper strata
  • What is special about the stratum lucidum?

    Found only in thick skin
  • What happens in the stratum granulosum?

    Keratinocytes die, nuclei and organelles disintegrate.
  • 1.2 Dermis

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  • What type of tissue is the dermis made out of?

    The dermis consists primarily of dense connective tissue.
  • What are the two layers of the dermis?

    Papillary layer and reticular layer.
  • What is found in the papillary layer?

    Loose connective tissue, elastin & collagen, dermal papillae (form fingerprints).
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