primordium

primordium (prI-mor´-de-um)

An aggregation of cells in the embryo indicating the first trace of an organ or structure.anlage (1); [L. origin, fr. primus, first, + ordior, to begin]
frontonasal p. frontonasal prominence
lateral nasal p. lateral nasal prominence
medial nasal p. medial nasal prominence

 

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