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3. Starfish (Asterias) early embryology Blastopore Archenteron (early gut) Ectoderm Endoderm Nucleolus Nucleus Single cell (haploid gamete) Nucleus not visible Single diploid cell (Early cleavage = 10 or fewer cells) OR

4. -ovum , an unfertilized egg; nucleus and nucleolus are visible - zygote , a fertilized egg (diploid); the nucleus is not visible - 2 cells , the product of mitosis of the zygote, cell size is halved, then again to 4 cells , etc., to blastula -gastrula forms as a result of the infolding of cells to form a gut

6. Archenteron

7. FROG EMBRYOLOGY Ovary Early cleavage Gastrula Eggs Early cleavage Blastula Neurula Micromeres Macromeres Animal pole Vegetal pole Vegetal pole Micromeres Macromeres Animal pole Blastocoel Blastocoel (the smaller cavity) Archenteron Ectoderm Mesoderm Endoderm Blastopore Yolk plug Neural groove (forming neural tube) Gut Somites Notochord (Early cleavage = 16 or fewer cells)

11. CHICK EMBRYO Eye Brain Ear (hard to see) Heart Neural tube Somites

13. Misc follows

18. Archenteron