membranes

• 1) at least two types of tissue make up membranes
• 2) membranes produce a fluid but the fluid isn't always present

• number of layers present
• many are found so close together that they form a layer

one layer of epithelium

multiple layers of epithelium (at least 2)

• 1) connective tissue
• 2) epithelium

• aka the skin, stratified squamous cells, dense irregular connective tissue is the deep dermis or hypodermis
• skin is the largest organ in the body

• lines the body cavities that are open to the exterior
• secrete mucin to lubricate and to protect
• prevent dessication of tissues

• 1) mouth
• 2) eyes
• 3) ears
• 4) nose
• 5) urethra
• 6) anus
• 7) vagina

• made of simple squamous epithelium
• line ventral body cavities not open to the exterior
• lines organs
• f: produce a thin, watery fluid to prevent friction and to prevent two layers from sticking together

• 1) visceral layer: lines the organ "touching the fist"
• 2) pleura: lines the wall of the cavity

• 1) peritoneum
• 2) pericardium
• 3) pleura
• 4) synovial joints

special type of serous membrane, that produces a semi-thick liquid to reduce friction in joints (thinner than mucus, thicker than serous)

• parietal and viscera exist as this (very very close to one another) through surgery and disease this potential space can be opened up to a true or real space
• ("shirt against arm" can become "gap between arm and shirt")