1. Chapter 4—Integumentary System
Skin and Body Membranes

2. What is a body membrane??
A sheet of tissue that does one of the following: 1.) Cover body surfaces 2.) Line body cavities 3.) Form protective sheets

3. What kind of membranes are in the body??
Epithelial Membranes made up of epithelial cells Ex.) Cutaneous, Mucous, Serous Connective Tissue Membrane made up of fibrous tissue Ex.) Synovial

4. Epithelial Membranes
Cutaneous Outer layer (think skin) Mucous “Wet Tissue” lines open body cavities Serous lines closed body cavities

5. Cutaneous Membranes
Characteristics: --Superficial Epidermis Layer --Made up of Stratified Squamous tissue --Contains Keratin becomes hard and waterproofed --Underlying Dermis Layer

6. Cutaneous Membrane

7. Mucous Membranes Characteristics:
--Moist Tissue --Lines body cavities “open” to the exterior --Sheet of epithelial cells --Rests on Areolar Connective Tissue (called --Lamina Propria) --Has the ability to secrete and absorb

8. Mucous Membranes

9. Serous Membranes
Characteristics: Lines “closed” body cavities ( in the Ventral Body Cavity) 1 Layer of simple squamous tissue Rests on Areolar Connective Tissue (called Lamina Propria)

10. Serous Membranes
2 Layers: Visceral (wraps around an organ) Parietal (lines the cavity)

11. Serous Membranes Found in three areas:
PericardiumSerous membrane around the heart
Pleura  Serous membrane around the lungs
Peritoneum Serous membrane around digestive organs

12. Pericardium

13. Pleura

14. Peritoneum

15. Connective Tissue Membrane
Synovial Membrane—body’s only connective tissue membrane --Found where two bones meet (Joint Articulation) --Fibrous joint capsule --Secretes Synovial Fluid to decrease friction

16. Synovial Membrane

17. Skin

18. Skin has 3 layers:
Epidermis:  Outermost Layer  Does not have it’s own blood supply Dermis:  Supplies and Nourishes the Epidermis  Connective Tissue Layer Subcuataneous Fat Layer:  Made up of Adipose Tissue  Absorbs Shocks and Insulates the body  Anchors the skin down

19. Facts about your skin:
 Major function is to Protect!  About as thick as a paper towel  Largest organ of the human body  Provides a covering for your body  Regulates heat loss and body temperature  Keratinized and Stratified

20. More Facts about your skin:
Insulates and Cushions Deeper Structures Protects from Damage Ex.) bumps, bruises, chemical & thermal , UV and bacterial protections  Excretes wastes (through sweat)  Manufactures Vitamin D (when in sunlight)  Contains receptors that sense: touch, pressure, temperature & pain

21. Structure of the Skin: