coelom is a topic covered in the Taber's Medical Dictionary.

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(sē′lŏm )

[Gr. koiloma, a cavity]
The fluid-filled cavity in an embryo that forms in the mesoderm as a coalescence of outpouchings of the endoderm. In humans, the coelom develops into the pleural, peritoneal, and pericardial cavities. These fluid-filled cavities are enclosed sacs lined by mesodermal cells that are specialized to transport fluid into and out of the cavity. Organs, e.g., heart, lungs, digestive tract, and liver, protrude into the coelomic cavity, where the surrounding fluid partially isolates them from outside forces.
SYN: SEE: body cavity

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