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Encyclopedic overview
A body cavity is any space or compartment, or potential space, in an animal body. Cavities accommodate organs and other structures; cavities as potential spaces contain fluid.
The two largest human body cavities are the ventral body cavity, and the dorsal body cavity. In the dorsal body cavity the brain and spinal cord are located.
Excerpted from Wikipedia’s “body cavity” article, available under the CC BY-SA 4.0 licence.