By the broadest definition, a body cavity is any fluid filled space in a multicellular organism. However, the term usually refers to the space, located between an animal’s outer covering (epidermis) and the outer lining of the gut cavity, where internal organs develop.

The type of body cavity places an organism into one of these three groups:

• Coelomate animals (also known as eucoelomates--"true coelom") have a fluid filled body cavity called a coelom (pronounced: sē'ləm) with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers). The complete mesoderm lining allows organs to be attached to each other so that they can be suspended in a particular order while still being able to move freely within the cavity. Most bilateral animals, including all the vertebrates, are coelomates.

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I need to go on a walk. I can't stop thinking about acoelomates, coleomates and psudeocoelomates.
mindlessmusing (Andrea Whaley) Mon, 14 Dec 2009 22:01:06 -0000
I need to go on a walk. I can't stop thinking about acoelomates, coleomates and psudeocoelomates.

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