Three general Membranes!

Our goals

• Describe the 3 membrane types– And subtypes

• Know what tissue each is made of• Determine where each would be found• Describe each of their general functions

Membranes • They cover and line parts of the body• Made of more than one layer of at least 2 type

tissue • What is made of more than one tissue??

Serous Membranes

• Line organs and walls in ventral cavities (what cavities reside there?)

• Moist!• Make sliding along each

other possible!

2 layers• 1.) simple

squamous epithelium

• 2.) thin Areolar CT

Serous Membrane Functions

• Enrich fluid from capillaries with some cell adhesion molecules

• Fluid between membrane allows for slight movement

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2 types of serous membranes

• Visceral serosa – lines organ• Parietal serosa – lines cavity wall

Serosa

Lungs• Parietal Pleura• Visceral Pleura

Organs (abdominal pelvic)

• Parietal peritoneum• Visceral peritoneum

Heart• Parietal

pericardium• Visceral

pericardium

Mucous Membranes

• Lines cavities “open” to exterior• Wet and moist! • Secretes mucous and other products • Don’t forget it is great for absorbtion• Layers:1. simple Squamous or columnar2. Loose CT 3. Smooth muscle (maybe)

Cutaneous Membranes

• Only “dry” membrane • Skin! • 2 Layers

»Keratinized Stratified Squamous Cells!»Dense Irregular CT