Epiblast

Part of speech: noun

Definitions

1. A cellular layer within an embryo that differentiates into the ectoderm, including skin and nervous tissue
2. An essential embryonic structure that contributes to the development of skin cells and neural components
3. A layer of embryonic cells that forms the ectoderm, which later develops into skin and nervous system tissues

Etymology: "Epiblast" is a technical coinage built from two Greek elements. "Epi-" is the Greek preposition meaning "upon" or "on top of," and "-blast" comes from Greek "blastos," meaning "bud" or "sprout," which biologists adopted as a combining form for embryonic cells and tissue layers. Put together, the name describes a layer lying on top of the other early embryonic layers. The term was made by scientists rather than inherited from antiquity, so the ancient Greeks had no notion of an epiblast. Its logic follows the older term "hypoblast," which names the layer beneath it, and both belong to the same family of embryological vocabulary built from the same Greek stem. The word is therefore best understood as a deliberate label coined to name a specific developmental layer, with its meaning contained in its parts.

Synonyms: ectoderm, outer layer, embryonic layer, cell layer, tissue layer