2. Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Body Membranes

3. 2 Types of Membranes in our Bodies 1. Epithelial Membranes 1.Cutaneous 2.Mucous membranes (mucosa) 3.Serous (serosa) 2. Connective Tissue Membrane 1.Synovial Membrane

4. Slide 4.3 Epithelial membranes 1. Cutaneous Membrane ( 1. Cutaneous Membrane (AKA Skin)  “dry” – exposed to air stratified squamous epithelium & dense fibrous connective tissue protection, maintains boundaries, synthesize Vit D, Insulates, nerve receptors Stratified squamous Dense fibrous

5. Slide 4.4 Epithelial Membranes 2. Mucous Membranes (mucosa) Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Epithelium & loose connective tissue underneath  absorption or secretion open to the exterior  lines all organs that open to the exterior (respiratory & digestive system) Figure 4.1b

6. Slide 4.5 Epithelial membranes 3. Serous Membranes (serosa) Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  simple squamous epithelium & loose connective tissue  surrounds body organs (closed to exterior)  Composed of 2 layers separated by fluid Figure 4.1c

7. Serous Membranes (Cont.) Come in paired layers (serous fluid between layers) – Parietal: layer lines the cavity – Serous Fluid (between layers) – clear fluid – Visceral: layer lines the organ (viscera) – Named by location (see next slide)

8. Slide 4.6 Examples of Serous Membranes Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Peritoneal cavity Peritoneum Pleura Pericardium

9. Slide 4.7 Connective Tissue Membrane Synovial Membrane Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Dense Fibrous connective tissue  lines capsules surrounding joints  Lubricates joint  Bursae- sacs under ligaments - cushion Figure 4.2 bursae