Integumentary System  

  • Anatomy- This system contains skin, hair, fat and nails. It is is the largest system of the body.
  • Physiology- The physiology of the integumentary system is broad and complex. It is where some wastes are excreted, Vitamin D is synthesized, temperature regulation occurs and skin color is produced.
Layers of Skin from Superficial to Deep
  • Epidermis
    1. the outer layer
    2. protects the body
  • Dermis
    1. made up of collagen and elastin
    2. also includes nerves, hair follicles and sweat (sudoriferous) glands
    3. “true skin” layer
  • Subcutaneous/ Hypodermis
    1. contains adipose (fat) tissue
    2. contains the blood supply
The layers of the epidermis:
  • Stratum germinativum/basale – deepest layer
  • Stratum spinosum
  • Stratum granulosum
  • Stratum lucidum
  • Stratum corneum – superficial layer
The functions of specialized cells:
  • Langerhans cells – protect from infection
  • Merkel cells – help with sensation
The skin pigments:
  • Melanin (brown/black)
  • Carotene (orange-ish)
Other Terms
  • Sebaceous Glands- Forms body oil
  • Sweat Glands- Sudoriferous/Eccrine Glands
  • Vitamin D3- Synthesized in the skin