出典:Wiktionary
出典:『Wiktionary』 (2025/10/22 14:47 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/18 04:00 UTC 版)
A primordium (plural: primordia), in embryology, is defined as an organ or tissue in its earliest recognizable stage of development. Cells of the primordium are called primordial cells
![]()