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The Integumentary System. integument – Latin word meaning “to cover” Composed of: Skin Accessory Organs – hair & nails. Functions Protection Body temp regulation Excretion Information Gathering Vitamin D Production. SKIN. Epidermis. Hypodermis. Outermost layer

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the integumentary system
The Integumentary System
  • integument– Latin word meaning “to cover”
  • Composed of:
      • Skin
      • Accessory Organs – hair & nails
  • Functions
    • Protection
    • Body temp regulation
    • Excretion
    • Information Gathering
    • Vitamin D Production
slide2
SKIN

Epidermis

Hypodermis

  • Outermost layer
  • Rapid cell division occurs
  • Contain melanocytes: produce melanin
      • Shed/Wash away every 14-28 days
        • Waterproof covering
  • beneath the dermis, layer of fat: insulation
  • Underneath Epidermis
  • Contain:
      • Blood vessels, Nerve endings, Glands, Sense Organs, Smooth Muscle, Hair Follicles
  • Help regulate body temperature

Dermis

hair and nail
Hair and Nail

Hair Follicles

Nail Matrix

  • Epidermal cells that extend into dermis
  • Rapid cell growth at base of hair follicle: hair growth
  • Hair – columns of cells that have filled with keratin and then died.
  • Sebaceous Gland – maintain condition of hair (soft and flexible).
  • Located tips of fingers and toes
  • Nail growth:

0.5 to 1.2 mm per day

Keratin: tough fibrous protein in which

hair, nails, and calluses are composed of