Streeters developmental horizon

From Biology-Online Dictionary | Biology-Online Dictionary

Streeter's developmental horizon

A term borrowed from geology and archeology by Streeter to define 23 developmental stages in young human embryos, from fertilization through the first 2 months; each horizon spanned 2 to 3 days and emphasized specific anatomic characteristics, to avoid discrepancies in the determination of age and body dimensions.

Origin: G.L. Streeter