By: Kimanh Nguyen

The skin serves as a protective barrier against infections, injuries, and ultraviolet radiation from the sun. It also helps regulates the body temperature

external image skin-cross-section1.bmp

The skin cross section includes:

  1. Skin
  2. Hair
  3. Nails
  4. Sweat glands
  5. Sebaceous glands
  6. Epidermis
  7. Dermis
  8. Hypodermis
  9. Fat
  10. Nerves
  11. Blood vessels
  12. Sweat pore
  13. Hair follicle


v Skin

  • § The largest organ of the body
  • Ø Protects us from microbes
  • Ø Helps regulate body temperature
  • Ø Permits the sensation of touch, heat, and cold

v Hair

  • Ø Insulation
  • Ø Provides some protection
  • Ø Affects physical appearance

v Nails

  • Ø Protect sensitivity of the fingers/toes
  • Ø Affect physical appearance

v Sweat glands

  • § Located in the dermis
  • Ø Secrete sweat to regulate body temperature

v Sebaceous glands

  • Ø Secrete an oily substance called sebum
  • Ø Protects and waterproofs hair and skin

v Epidermis

  • § Outermost layer of the skin
  • Ø A waterproof barrier
  • Ø Creates our skin tone

v Dermis

  • § Beneath the epidermis
  • Ø Contains tough connective tissue, hair follicles, and sweat glands

v Hypodermis

  • § Deeper subcutaneous tissue that is made of fat and connective tissue
  • Ø Binds the skin to the tissue beneath it

v Fat

  • Ø Energy supply
  • Ø Thermal insulation

v Nerves

  • Ø Connect the brain and spinal cord with various parts of the body
  • Ø Conducts impulses from the brain

v Blood vessels

  • § Include arteries and veins
  • Ø Carry blood throughout the body
  • Ø Contain oxygen and nutrients to take to the muscles

v Sweat pore

  • Ø Releases oil and sweat on the body to regulate body temperature

v Hair follicle

  • Ø Contains the root of a hair within its small tubular cavity