Definition

Noun: * Coelom (also spelled celom): A fluid-filled body cavity lined with mesodermal tissue (mesothelium) that is completely surrounded by the mesoderm. In vertebrate embryos, it forms within the mesoderm and later gives rise to major body cavities.

Usage

• The term celom is used primarily in the fields of embryology, zoology, and comparative anatomy to describe a fundamental anatomical feature of coelomate animals.
• It refers to the principal body cavity in many multicellular animals, containing and protecting internal organs.
• In human embryology, it specifically denotes the precursor cavity from which the pleural, pericardial, and peritoneal cavities develop.

Examples

• In Embryology:
  • The development of the celom is a key event in the early stages of the embryo.
  • Researchers studied how the celom partitions to form separate thoracic and abdominal cavities.
• In Zoology/Anatomy:
  • Animals like annelids and chordates possess a true celom.
  • The presence of a celom allows for greater complexity and organ mobility.

Advanced Usage

• Acoelomate: An animal lacking a celom (body cavity between the gut and body wall).
  • Flatworms are examples of acoelomate organisms.
• Pseudocoelomate: An animal with a body cavity (pseudocoel) not fully lined by mesoderm.
  • Roundworms are pseudocoelomates.
• Coelomate (or Eucoelomate): An animal possessing a true celom.
  • All vertebrates are coelomates.

Variants and Related Words

• Coelom (n): The standard and more common spelling of the same term.
• Coelomic (adj): Pertaining to the celom.
  • Coelomic fluid.
• Intraembryonic coelom: The celom that forms within the developing embryo proper.

Synonyms

• Body cavity
• Coelomic cavity

Different Meanings

The word celom has a single, specific meaning in biological sciences. It does not have common idiomatic or figurative uses.

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