Integumentary system<br />
The integumentary system<br />The skin and all its derivatives<br />E.g. Nails, hair, glands<br />Provides external protec...
Fxns of the Integumentary system<br />Protection<br />Skin secretions<br />Melanin <br />Physical/mechanical barriers<br /...
Body temperature regulation<br />Cutaneous sensation<br />Metabolic fxns<br />Synthesis of Vitamin D<br />Blood reservoir<...
Characteristics<br />Covers the entire body <br />Accounts for about 7% of total body weight <br />Pliable, yet durable <b...
Skin derivatives<br />Originates from the epidermis<br />Nails <br />The nail matrix contains rapidly dividing cells that ...
Sweat glands <br />Eccrine sweat glands <br />Found on the palms, soles, and forehead <br />Secretes sweat <br />Sweat is ...
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Integumentary System

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Integumentary System

  1. 1. Integumentary system<br />
  2. 2.
  3. 3. The integumentary system<br />The skin and all its derivatives<br />E.g. Nails, hair, glands<br />Provides external protection<br />
  4. 4. Fxns of the Integumentary system<br />Protection<br />Skin secretions<br />Melanin <br />Physical/mechanical barriers<br />Biological barriers<br />E.g. DNA<br />
  5. 5. Body temperature regulation<br />Cutaneous sensation<br />Metabolic fxns<br />Synthesis of Vitamin D<br />Blood reservoir<br />Excretion<br />
  6. 6. Characteristics<br />Covers the entire body <br />Accounts for about 7% of total body weight <br />Pliable, yet durable <br />Thickness: 1.5 to 4.0 mm <br />Composed of the epidermis and dermis <br />
  7. 7. Skin derivatives<br />Originates from the epidermis<br />Nails <br />The nail matrix contains rapidly dividing cells that eventually become dead and keratinized <br />Hardened nails protect the delicate tissues of the fingers and toes <br />Hair follicles and hair <br />Hair produced the hair follicles in the dermal layer of the skin <br />Hair is composed mainly of dead, keratinized cells <br />A strand of hair is composed of three layers: <br />Medulla – the innermost layer <br />Cortex – surrounds the medulla <br />Cuticle – provides strength and maintains the structure of the inner layers <br />Hair color is determined by the pigment melanin produced by melanocytes at the base of the hair follicle <br />
  8. 8. Sweat glands <br />Eccrine sweat glands <br />Found on the palms, soles, and forehead <br />Secretes sweat <br />Sweat is composed of mainly water and salts <br />Sweat is acidic and slows microbial growth on the skin <br />Apocrine sweat glands <br />Found in the anogenital and axillary (armpit) regions <br />Secretion contains the same components of true sweat plus fatty substances and proteins <br />Produces “body odor” <br />Ceruminous glands – produce wax <br />Wax deters insects and blocks the entry of foreign material into the ear canal <br />Mammary gland – specialized sweat glands that secrete milk <br />Sebaceous (oil) glands <br />Found all over the body except on the palms and soles <br />Produce oil (sebum) <br />Sebum softens and lubricates the hair and skin; waterproofs the hair and skin <br />

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