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Summary Stage Literature (233) Attributions Wiki

Name: NF stage 19

XAO ID: 1000035

Definition: "Nieuwkoop and Faber stage 19, corresponding to an embryo of age 20 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Initial neural tube stage. Neural folds touching each other, except for inconstant openings at anterior and posterior end and behind nucal region. Considerable lateral extension of brain. Lateral outline of embryo still convex. Length: 1.5 - 1.6 mm."

Preceded By: NF stage 18 Succeeded By: NF stage 20