Embryonic Structure
chorioallantoic membrane Audio
[ kor-ee-oh-uh-lan-toh-ik mem-brayn ]
Subclass of:
Extraembryonic membranes; Embryo, Nonmammalian
Definitions related to chorioallantoic membrane:
  • A highly vascularized extra-embryonic membrane, formed by the fusion of the CHORION and the ALLANTOIS. It is mostly found in BIRDS and REPTILES. It serves as a model for studying tumor or cell biology, such as angiogenesis and TISSUE TRANSPLANTATION.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • An extraembryonic, vascular structure that is found in the eggs of amniotes; in humans the inner membrane forms the amniotic sac, and the outer membrane forms the chorion, which is part of the placenta.
    NCI
    U.S. National Cancer Institute, 2021
  • Extraembryonic structure that develops from the fusion of the chorion and the allantois; in reptiles and birds, it is a membrane apposed to the egg shell; in many mammals, it forms the placenta.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The membrane in hens' eggs that helps chicken embryos get enough oxygen and calcium for development. The calcium comes from the egg shell.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
Try this search on: Farlex, Merriam-Webster, Oxford Dictionary, or Wordnik

This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.