Anatomy

Fetus

The unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. In humans, the unborn young from the end of the eighth week after CONCEPTION until BIRTH, as distinguished from the earlier EMBRYO, MAMMALIAN.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

The unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. In humans, the unborn young from the end of the eighth week after CONCEPTION until BIRTH, as distinguished from the earlier EMBRYO, MAMMALIAN.

MeSH Record

Classification

Related Concepts

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MeSH Record

See Also

MeSH Record

Synonyms

13 entry terms
  • Fetuses
  • Fetal Structures
  • Fetal Tissue
  • Mummified Fetus
  • Retained Fetus
  • Fetal Structure
  • Fetal Tissues
  • Fetus, Mummified
  • Fetus, Retained
  • Structure, Fetal
  • Structures, Fetal
  • Tissue, Fetal
  • Tissues, Fetal

MeSH Record

Aspects Covered

21 allowable subheadings

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

MeSH Record

Indexing Annotation

mammalian only; human: 3d month to term; fetus in fetu: index under FETUS /abnorm; FETUS and PREGNANCY: Manual 18.4.3, 21.55; specialty for fetus & newborn infant = PERINATOLOGY; lithopedion: coordinate FETUS (IM) + CALCINOSIS (IM); intrauterine surgery goes under FETUS /surg; fetal organs & tissues in tissue & cell cultures: coordinate FETUS + organ or tissue without qualifiers + culture term, all probably NIM

MeSH Record

History Note

1972 (1963)

MeSH Hierarchy

Tree Number

  1. A16.378w

AMA Style

References

  1. National Library of Medicine. Fetus. Medical Subject Headings (MeSH). 2026. Unique ID D005333. http://id.nlm.nih.gov/mesh/2026/D005333
  2. Fetus. In: Wikipedia. https://en.wikipedia.org/wiki/Fetus_(biology)
  3. Fetus. In: Wikidata. https://www.wikidata.org/wiki/Q17013437