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Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

The Embryonic Period

Week 1 – from zygote to blastocyst

Conception – in lateral third of uterine tube

Zygote (fertilized oocyte) moves toward the uterus

Blastomeres – daughter cells formed from zygote

Morulasolid cluster of 12–16 blastomeres

“Mulberry”

Blastocyst – fluid-filled structure – ~ 60 cells

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