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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. SKIN. Epidermis. Hypodermis. Outermost layer

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The Integumentary System

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  1. 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

  2. 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

  3. 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

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