Anatomy

Blastodisc

A small whitish spot on the surface of the EGG YOLK where cleavage begins. Upon fertilization the cytoplasm streams from the vegetal pole away from the yolk to the animal pole where cleavage will occur. This germinal area eventually flattens into a layer of cells (BLASTODERM) that covers the yolk completely.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A small whitish spot on the surface of the EGG YOLK where cleavage begins. Upon fertilization the cytoplasm streams from the vegetal pole away from the yolk to the animal pole where cleavage will occur. This germinal area eventually flattens into a layer of cells (BLASTODERM) that covers the yolk completely.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

Synonyms

9 entry terms
  • Germinal Area
  • Germinal Disc
  • Area, Germinal
  • Areas, Germinal
  • Blastodiscs
  • Disc, Germinal
  • Discs, Germinal
  • Germinal Areas
  • Germinal Discs

MeSH Record

Aspects Covered

23 allowable subheadings

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

MeSH Record

History Note

2008

MeSH Record

Previous Indexing

  • Chick Embryo (1964-2007)

MeSH Hierarchy

Tree Number

  1. A16.331.042w

AMA Style

References

  1. National Library of Medicine. Blastodisc. Medical Subject Headings (MeSH). 2026. Unique ID D054239. http://id.nlm.nih.gov/mesh/2026/D054239
  2. Blastodisc. In: Wikipedia. https://en.wikipedia.org/wiki/Blastodisc
  3. Blastodisc. In: Wikidata. https://www.wikidata.org/wiki/Q4088024