coelom

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coelom

The embryo's coelom is visible in this developmental diagram.

Definition
  1. Noun:
    • A body cavity in animals: A coelom is a fluid-filled cavity that is completely lined by tissue derived from the mesoderm, one of the primary germ layers in a developing embryo. It forms a space that separates the gut from the body wall and houses internal organs.
    • An embryological structure: In embryology, the coelom refers to the cavity that forms within the mesoderm and later gives rise to major body cavities in complex animals, including humans.
Examples of Usage
  • Noun:
    • The presence of a true coelom is a key characteristic that distinguishes coelomates from other animal groups.
    • During development, the embryonic coelom partitions to form the pleural and peritoneal cavities.
Advanced Usage
  • "coelomic cavity": Another term for the coelom itself, emphasizing it as a space.
    • The internal organs are suspended within the coelomic cavity.
  • "coelomic fluid": The fluid that fills the coelom, which may aid in circulation, waste transport, or hydrostatic support.
    • The coelomic fluid provides a medium for the transport of nutrients and gases.
Variants and Related Words
  • Coelomate (n): An animal that possesses a true coelom.
    • Annelids and chordates are examples of coelomates.
  • Pseudocoelom (n): A body cavity that is not fully lined by mesodermal tissue.
    • Nematodes have a pseudocoelom.
  • Acoelomate (n/adj): An animal that lacks a body cavity between the gut and body wall.
    • Flatworms are acoelomate animals.
Synonyms
  • Body cavity: A general term for any significant space within the body.
  • Splanchnocoel: A more specific embryological term for the coelom.
Related Phrases
  • "enterocoelic coelom formation": A mode of coelom development where the cavity forms from outpocketings of the embryonic gut (archenteron).
    • Echinoderms exhibit enterocoelic coelom formation.
  • "schizocoelic coelom formation": A mode of coelom development where the cavity forms from splits within solid masses of mesoderm.
    • Annelids and arthropods exhibit schizocoelic coelom formation.
coelom

The embryo's coelom is visible in this developmental diagram.

Noun
  1. a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity

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