1. Chapter 4
Pages
Body Membranes

2. Body Membranes Two major groups: Epithelial membranes
Cutaneous
Mucous
Serous
Connective tissue membranes
Synovial membranes

3. Epithelial Membranes Aka: covering and lining membranes
Not exactly true epithelium
DO contain and epithelial sheet
ALSO combined with underlying layer of connective tissue

4. Cutaneous Membrane
Skin – superficial epidermis composed of keratinizing stratified squamous epithelium
Dermis is mostly dense connective tissue
Dry membrane
Exposed to air

5. Mucous Membranes
Epithelial layer resting on loose connective tissue called lamina propria.
Lines all body cavities that open to the exterior (hollow organs)
Respiratory
Digestive
Urinary
Reproductive
Mucosa refers to location
Mostly stratified squamous epithelium
Some simple columnar
All are “wet” or moist
Mucosae often adapted for secretion or absorption

6. Serous Membranes
Two layers of simple squamous epithelium resting on thin layer of areolar connective tissue
Lines cavities closed to the exterior (exceptions: dorsal can joint cavities)
Membranes occur in pairs
Parietal (“wall”) layer lines a portion of the wall of the ventral cavity and folds in on itself
The inner layer is the visceral layer which covers the outside of the organs in that cavity

7. Serous Membranes Cont.
Serous layers are separated by small quantity of serous fluid
Secreted by both membranes, keeps them in contact with each other
Allows organs to slide with zero friction
Name of serosae depends on location
Peritoneum – abdominal cavity and covering organs
Pleura – membrane surrounding the lungs
Pericardium – membrane surrounding the heart

8. Connective Tissue Membranes
Synovial membranes
Soft areolar CT and no epithelial cells
Line fibrous capsules surrounding joints
Provide smooth surface
Secrete lubricating fluid
Also line small sacs of CT called bursae and tube-like tendon sheaths
Both cushions organs moving against each other during muscle activity

9. Did you get it?
How do the body locations of serous and mucous membranes differ?
A scalpel penetrates the left lung and enters the heart. Name the six serous membrane layers the blade passes through as it moves from the body surface into the heart.
Where would you find a synovial membrane?