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Summary Stage Literature (410) Attributions Wiki

Name: NF stage 20

XAO ID: 1000036

Definition: "Nieuwkoop and Faber stage 20, corresponding to an embryo of age 21 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Neural folds fused, suture still present. The two eye anlagen showing through dumb-bell-shaped, eyes hardly protruding. Beginning of stretching of embryos. Lateral outline flat. Length: 1.7 - 1.8 mm."

Preceded By: NF stage 19 Succeeded By: NF stage 21