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- A membrane is a thin, flexible tissue that covers or lines structures.
- Membranes can also separate or connect body parts.
- A serous membrane is a double-layered membrane in body cavities.
- It does not open directly to the outside of the body.
- Serous membranes cover organs in the thoracic and abdominal cavities.
- They also line the walls of these cavities.
- The parietal layer lines the cavity walls.
- The visceral layer covers and attaches to the organs.
- Between the layers is a space with serous fluid.
- This fluid reduces friction during movement.
- It allows organs to move smoothly, such as during breathing.
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