<Tr> <Th> Greek </Th> <Td> koilōma </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The coelom is the main body cavity in most animals and is positioned inside the body to surround and contain the digestive tract and other organs . In developed animals, it is lined with a mesodermal epithelium . In other animals, such as molluscs, it remains undifferentiated . </P> <P> The term coelom derives from the ancient greek word κοίλια (koília), meaning "cavity". </P>

A coelomate animal has a body cavity that is completely lined by what kind of tissue