Embryonic Structure
germ layer Audio
germ lay·er
Subclass of:
Embryonic Structures
Definitions related to germ layers:
  • Embryonic tissue which has as its parts germ cells of predominantly one type with or without intercellular matrix.
    Foundational Model of Anatomy
    University of Washington, 2017
  • One of the three layers of primodial cells comprising the early embryo, formed during gastrulation.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The three primary germinal layers (ECTODERM; ENDODERM; and MESODERM) developed during GASTRULATION that provide tissues and body plan of a mature organism. They derive from two early layers, hypoblast and epiblast.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
  • Germ layer, any of three primary cell layers, formed in the earliest stages of embryonic development, consisting of the endoderm (inner layer), the ectoderm (outer layer), and the mesoderm (middle layer). The germ layers form during the process of gastrulation, when the hollow ball of cells that...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2020
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