ectoderm
/'ektoudə:m/
Definition
- Noun:
- The outermost of the three primary germ layers in an animal embryo: The "ectoderm" is the embryonic tissue layer that gives rise to the epidermis (skin) and the nervous system, including the brain and spinal cord.
Usage Examples
- Noun:
- During embryonic development, the ectoderm forms the skin and the central nervous system.
- The neural crest is a group of cells derived from the ectoderm.
Advanced Usage
- "Surface ectoderm": The portion of the ectoderm that gives rise to the epidermis, hair, nails, and glands of the skin.
- The surface ectoderm differentiates into the outer layer of the skin.
- "Neuroectoderm": The portion of the ectoderm that gives rise to the neural tube and neural crest cells, forming the brain, spinal cord, and peripheral nerves.
- The neuroectoderm is the precursor to the entire nervous system.
Variants and Related Words
- Ectodermal (adj): Pertaining to or derived from the ectoderm.
- Ectodermal dysplasia is a condition affecting tissues that originate from the ectoderm.
- Ectodermic (adj): An alternative adjective form meaning of or relating to the ectoderm.
Synonyms
- Epiblast (in some developmental contexts, though not a perfect synonym, as epiblast gives rise to ectoderm and other layers).
Related Terms (Not Phrasal Verbs or Idioms)
- Germ layer: One of the three primary layers (ectoderm, mesoderm, endoderm) in early embryonic development.
- Mesoderm: The middle germ layer.
- Endoderm: The innermost germ layer.
Noun
-
the outer germ layer that develops into skin and nervous tissue
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