Anatomy

Bursa of Fabricius

An epithelial outgrowth of the cloaca in birds similar to the thymus in mammals. It atrophies within 6 months after birth and remains as a fibrous remnant in adult birds. It is composed of lymphoid tissue and prior to involution, is the site of B-lymphocyte maturation.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An epithelial outgrowth of the cloaca in birds similar to the thymus in mammals. It atrophies within 6 months after birth and remains as a fibrous remnant in adult birds. It is composed of lymphoid tissue and prior to involution, is the site of B-lymphocyte maturation.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

See Also

MeSH Record

Synonyms

1 entry terms
  • Fabricius Bursa

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

66(65)

MeSH Hierarchy

Tree Numbers

  1. A10w.549w.175w
  2. A13.163w
  3. A15.382w.520w.604w.114w

AMA Style

References

  1. National Library of Medicine. Bursa of Fabricius. Medical Subject Headings (MeSH). 2026. Unique ID D002060. http://id.nlm.nih.gov/mesh/2026/D002060
  2. Bursa of Fabricius. In: Wikipedia. https://en.wikipedia.org/wiki/Bursa_of_Fabricius
  3. Bursa of Fabricius. In: Wikidata. https://www.wikidata.org/wiki/Q1016975