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Integumentary System

Integumentary System. I. Introduction. A. Definition. 1. Skin , Cutaneous Membrane , or Integument. 2. Largest organ 7% of body weight. 3. Divisions = Epidermis , Dermis , & Hypodermis. 4. Thick vs. Thin skin. II. Functions. 1. Protection from dehydration and mechanical damage.

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Integumentary System

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  1. Integumentary System I.Introduction A.Definition

  2. 1. Skin, CutaneousMembrane,or Integument 2. Largest organ 7% of body weight 3. Divisions = Epidermis, Dermis, & Hypodermis 4. Thick vs. Thin skin

  3. II.Functions

  4. 1. Protection from dehydration and mechanical damage 2. Sunscreen 3. Temperature Regulation 4. Waste Excretion 5. Produce Vitamin D 6. Sensory Reception

  5. III.Parts A.Epidermis

  6. 1. Definition a. Stratified squamous epithelium “Keratinized” b. Basic cell type called a keratinocyte c. All intercellular junction present d. Avascularand notinnervated

  7. 2. Strata “Layers” a. Basal,Spinosum,Granulosum,Lucidium, &Corneum Figure 4.3 Figure 4.4

  8. 3. Associated Cells a. Melanocytes b. Langerhans cells c. Merkel cells

  9. 4. Epidermal Derivatives a. Hair i. Parts ii. Types Figure 4.7

  10. b. Nail i. Parts Figure 4.9

  11. c. Sweat Glands i. Types

  12. B.Dermis

  13. 1. Definition a. Dense Irregular Connective Tissue b. Basic cell type = fibroblast (all others present) c. Collagen bundles thicken and increase in number with depth (PapillaryversusReticular) d. Highly vascularized and innervated

  14. 2. Strata & Function

  15. C.Hypodermis

  16. 1. Definition a. Loose Connective Tissue b. Basic cell type = adipocyte (all others present) c. Fat layer (subcutaneous layer) d. Highly vascularized and innervated

  17. IV.Problems A.Infections

  18. B.Tumors

  19. C.Wound Healing

  20. D.Burns

  21. Figure 4.11

  22. Does effort equal success?

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