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The Integumentary System

The Integumentary System. Chapter 5. Introduction. The integumentary system consists of hair, skin, and nails. Skin accounts for approximately 7% of total body weight (9-11 lbs) and varies in thickness (1.5 mm to 4.0 mm). Skin is composed of two distinct regions. LAYERS OF SKIN.

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The Integumentary System

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  1. The Integumentary System Chapter 5

  2. Introduction • The integumentary system consists of hair, skin, and nails. • Skin accounts for approximately 7% of total body weight (9-11 lbs) and varies in thickness (1.5 mm to 4.0 mm). • Skin is composed of two distinct regions.

  3. LAYERS OF SKIN

  4. SKIN FUNCTIONS • Protection • Body temperature regulation • Cutaneous sensation • Metabolic functions • Blood reservoir • Excretion of wastes

  5. EPIDERMIS • Cell Types • Keratinocytes • Melanocytes • Langerhans’ cells • Merkel cells

  6. EPIDERMIS • Layers • Stratum basale • Stratum spinosum • Stratum granulosum • Stratum lucidum • Stratum corneum

  7. DERMIS • Underlies the epidermis • Composed of two layers • Papillary layer= areolar loose connective tissue • Reticular layer= dense irregular connective tissue (80%) • Contains many nerve endings

  8. DERMIS

  9. Review Question What is the name of the inner-most layer of the epidermis? a. Hypodermis b. Stratum basale c. Stratum corneum d. Dermis e. Stratum lucidum

  10. Review Question Which layer of the dermis contains dense regular connective tissue? a. Hypodermis b. Papillary layer c. Reticular layer d. Stratum spinosum e. Stratum granulosum

  11. SKIN PIGMENTATION • Melanin • Carotene • Hemoglobin

  12. ACCESSORY OGRANS • Sweat glands • Eccrine • Apocrine • Ceruminous • Mammary • Sebaceous glands

  13. ACCESSORY ORGANS

  14. ACCESSORY ORGANS

  15. Review Question Which of the following refers to a modified sweat gland found in the external auditory meatus where it produces wax? a. Apocrine gland b. Eccrine gland c. Sebaceous gland d. Ceruminous gland e. Mammary gland

  16. Review Question Which of the following terms refers to the cuticle of the nail? a. Eponychium b. Hyponychium c. Lunula d. Matrix e. Root

  17. SKIN DISORDERS • Skin cancer

  18. SKIN CANCERS Skin Cancer Video

  19. SKIN DISORDERS • Skin cancer • Burns

  20. SKIN DISORDERS

  21. Rule of Nines

  22. SKIN DISORDERS • Skin cancer • Burns • Rosacea

  23. ROSACEA

  24. Skin cancer Burns Rosacea Dermatitis Contact dermatitis Acne Jaundice Seborrhea Hirsutism Alopecia Impetigo Psoriasis Albinism Striae SKIN DISORDERS

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