Membranes of the body

1. 4.6 Covering and Lining Membranes
• Composed of at least two primary tissue types: an epithelium
bound to underlying connective tissue proper layer
• Three types
– Cutaneous membranes
– Mucous membranes
– Serous membranes
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2. Cutaneous Membranes
• Another name for skin
• Keratinized stratified squamous epithelium (epidermis) attached
to a thick layer of connective tissue (dermis)
• Unlike other membranes, skin is a dry membrane
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3. Figure 4.11a Classes of membranes.
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Cutaneous membrane
The cutaneous membrane (the skin)
covers the body surface.
Cutaneous
membrane
(skin)

4. Mucous Membranes
• Mucosa indicates location, not cell composition
• Also called mucosae
– Line body cavities that are open to the exterior (example: digestive,
respiratory, urogenital tracts)
• Moist membranes bathed by secretions (or urine)
• Epithelial sheet lies over layer of loose connective tissue called
lamina propria
• May secrete mucus
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5. Figure 4.11b Classes of membranes.
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Mucous membranes
Mucous membranes line body
cavities that are open to the
exterior.
Mucosa
of nasal
cavity
Mucosa
of mouth
Esophagus
lining
Mucosa
of lung
bronchi

6. Serous Membranes
• Also called serosae
• Found in closed ventral body cavities
• Constructed from simple squamous epithelium (called mesothelium) resting
on thin areolar connective tissue
• Parietal serosae line internal body cavity walls
• Visceral serosae cover internal organs
• Cavity between layers is filled with slippery serous fluid, so these are moist
membranes
• Special names given to show location: pleurae (lungs), pericardium
(heart), peritoneum (abdomen)
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7. Figure 4.11c Classes of membranes.
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Serous membranes
Serous membranes line body cavities
that are closed to the exterior.
Parietal
pleura
Visceral
pleura
Parietal
pericardium
Visceral
pericardium
Parietal
peritoneum
Visceral
peritoneum

8. 4.7 Tissue Repair
• When the body’s barriers are compromised, the inflammatory and
immune responses are activated
• Repair starts very quickly
• Repair is the function of the inflammatory process
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