4-Zoology-Development-Stages-Gestation-Embryo 005 Day
blastocyst
5 days: Human embryos have several hundred cells in one layer in a hollow sphere {blastocoel} {blastocyst}, with inside cavity filled with fluid. Human blastocyst has extra cells at one spot.
blastula
5 days: Lower-animal embryos have cell spheres {blastula}.
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Date Modified: 2022.0225