Anatomy

Blastomeres

Undifferentiated cells resulting from cleavage of a fertilized egg (ZYGOTE). Inside the intact ZONA PELLUCIDA, each cleavage yields two blastomeres of about half size of the parent cell. Up to the 8-cell stage, all of the blastomeres are totipotent. The 16-cell MORULA contains outer cells and inner cells.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Undifferentiated cells resulting from cleavage of a fertilized egg (ZYGOTE). Inside the intact ZONA PELLUCIDA, each cleavage yields two blastomeres of about half size of the parent cell. Up to the 8-cell stage, all of the blastomeres are totipotent. The 16-cell MORULA contains outer cells and inner cells.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

Synonyms

3 entry terms
  • Blastomere
  • Blastocytes
  • Blastocyte

MeSH Record

Aspects Covered

15 allowable subheadings

Indexed with the subheadings chemistry, classification, cytology, drug effects, enzymology, immunology, metabolism, microbiology, parasitology, pathology, physiology, radiation effects, transplantation, ultrastructure, virology.

MeSH Record

Indexing Annotation

do not confuse entry term BLASTOCYTES with BLASTOCYST

MeSH Record

History Note

80

MeSH Record

Previous Indexing

  • Blastocyst (1974-1979)
  • Cell Division (1966-1979)
  • Zygote (1975-1979)

MeSH Hierarchy

Tree Numbers

  1. A11w.872w.700.250w.130w
  2. A16.094w

AMA Style

References

  1. National Library of Medicine. Blastomeres. Medical Subject Headings (MeSH). 2026. Unique ID D001757. http://id.nlm.nih.gov/mesh/2026/D001757
  2. Blastomeres. In: Wikipedia. https://en.wikipedia.org/wiki/Blastomere
  3. Blastomeres. In: Wikidata. https://www.wikidata.org/wiki/Q882097