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. Author manuscript; available in PMC: 2023 Dec 7.
Published in final edited form as: Semin Cell Dev Biol. 2022 May 21;131:35–43. doi: 10.1016/j.semcdb.2022.05.004

Figure 1. Staging Human Gastrulation.

Figure 1

a, Timescale of early human development highlighting Carnegie stages and key events during this period. b, Schematic diagram showing a human embryo at around Carnegie Stage 6b at the onset of gastrulation. c, Graph showing the onset of primitive streak formation and progression in size during Carnegie stages 6 to 8. Adapted from O’Rahilly 1973 Figure 235. ED, Embryonic Disk; PS, Primitive Streak.