CLASSIFICATION OF BODY MEMBRANES

Epithelial Membranes  1. Cutaneous Membrane  2. Mucous Membranes  3. Serous Membranes

1. Cutaneous Membrane  Skin!

 Stratified squamous epithelium with keratin  Has an underlying dermis  Differs from the other types of epithelial membranes: It is DRY!

Cutaneous Membrane

2. Mucous Membranes  Lines all body cavities OPEN to the outside world  Either stratified squamous or simple columnar  Moist/Wet  Absorption  Secretion

Mucous Membranes

3. Serous Membranes  Line body cavities CLOSED to the outside world  Single layer of simple squamous epithelium  Serous membranes occur in pairs  Visceral  Parietal  Both membranes secrete “serous fluid” so that organs can move without friction

Parietal vs. Visceral

Pleura & Pericardium

Peritoneum

Connective Tissue Membranes  NO epithelium; just connective tissue  Synovial membranes  Line the capsules that surround joints  Provide a smooth surface  Secrete “synovial fluid,” which lubricates

Synovial Membranes