Somitic segmentation and amoeboid cell movement
oriented cell divisions in the neuroectoderm, compaction of somites, neural keel formation.
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Movie#2537. Zebrafish embryo at the 5-somite stage
The cross-sectional view is in the ventral portion of the neural keel. In the lower portion of the image, somites detach from ventral mesoderm. Oriented divisions occur within the neural keel.
At the level of the first somite, amoeboid cells located underneath the hypoblast migrate laterally on the surface of the yolk cell.