Stage 14 (15 hrs 0 min)
Pre-mid gastrula stage
Drown by T. Iwamatsu
(Abbr. dl: dorsal lip of blastopore)Ê
Stage 14 (15 hrs 0 min) Pre-mid gastrula stage:
Epiboly progressively advances and the blastoderm covers about 1/3 of the yolk sphere. The germ ring is well-defined, and the embryonic shield increases in size. Weak, rhythmically undulating movements [3,29] begin to occur on the blastoderm but not on the uncovered yolk sphere.