Anatomy

Gestational Sac

Round-shaped structure usually located in the upper fundus of the UTERUS in early pregnancy. It comprises EMBRYO; AMNIOTIC FLUID; and YOLK SAC. It is visible in PRENATAL ULTRASONOGRAPHY by the fifth week of pregnancy. Its size is often used to determine and monitor GESTATIONAL AGE; FETAL GROWTH; and PREGNANCY COMPLICATIONS.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Round-shaped structure usually located in the upper fundus of the UTERUS in early pregnancy. It comprises EMBRYO; AMNIOTIC FLUID; and YOLK SAC. It is visible in PRENATAL ULTRASONOGRAPHY by the fifth week of pregnancy. Its size is often used to determine and monitor GESTATIONAL AGE; FETAL GROWTH; and PREGNANCY COMPLICATIONS.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

Synonyms

7 entry terms
  • Gestation Sac
  • Gestation Sacs
  • Gestational Sacs
  • Sac, Gestation
  • Sac, Gestational
  • Sacs, Gestation
  • Sacs, Gestational

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

2011

MeSH Hierarchy

Tree Number

  1. A16.535w

AMA Style

References

  1. National Library of Medicine. Gestational Sac. Medical Subject Headings (MeSH). 2026. Unique ID D058746. http://id.nlm.nih.gov/mesh/2026/D058746
  2. Gestational Sac. In: Wikipedia. https://en.wikipedia.org/wiki/Gestational_sac
  3. Gestational Sac. In: Wikidata. https://www.wikidata.org/wiki/Q5553682