Anatomy

Allantois

An extra-embryonic membranous sac derived from the YOLK SAC of REPTILES; BIRDS; and MAMMALS. It lies between two other extra-embryonic membranes, the AMNION and the CHORION. The allantois serves to store urinary wastes and mediate exchange of gas and nutrients for the developing embryo.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An extra-embryonic membranous sac derived from the YOLK SAC of REPTILES; BIRDS; and MAMMALS. It lies between two other extra-embryonic membranes, the AMNION and the CHORION. The allantois serves to store urinary wastes and mediate exchange of gas and nutrients for the developing embryo.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

See Also

MeSH Record

Synonyms

2 entry terms
  • Allantoic Membrane
  • Membrane, Allantoic

MeSH Record

Aspects Covered

24 allowable subheadings

Indexed with the subheadings abnormalities, anatomy & histology, blood supply, chemistry, cytology, diagnostic imaging, drug effects, embryology, enzymology, growth & development, immunology, injuries, innervation, metabolism, microbiology, parasitology, pathology, physiology, physiopathology, radiation effects, surgery, transplantation, ultrastructure, virology.

MeSH Record

History Note

91(75); was see under FETAL MEMBRANES 1975-90

MeSH Hierarchy

Tree Numbers

  1. A10w.615w.284w.147w
  2. A16.254.750w.147w

MeSH Record

NLM Classification

QS 645

AMA Style

References

  1. National Library of Medicine. Allantois. Medical Subject Headings (MeSH). 2026. Unique ID D000482. http://id.nlm.nih.gov/mesh/2026/D000482
  2. Allantois. In: Wikipedia. https://en.wikipedia.org/wiki/Allantois
  3. Allantois. In: Wikidata. https://www.wikidata.org/wiki/Q1364012