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Summary Stage Literature (232) Attributions Wiki

Name: NF stage 42

XAO ID: 1000054

Definition: "Nieuwkoop and Faber stage 42, corresponding to an embryo of age 3 days, 8 hr at 22-24 Celsius and having the following external morphological criteria: Beginning of formation of opercular folds. Torsion of intestine about 90 degrees; proctodeum connected with yolk mass by short horizontal intestinal tube. Length: 7.0 - 7.7 mm."

Preceded By: NF stage 41 Succeeded By: NF stage 43