Embryonic Development, 12 Stages

This enlarged model represents the following stages of embryo development:

• Ovule shortly after fertilization
• Two-cell stage
• Four-cell stage
• Seven-cell stage
• Morula stage
• Blastocyst with trophoblast and embryoblast
• Blastocyst with early formation of embryo process
• Blastocyst with start of implantation
• Embryo (approx. 12th day)
• Embryo (approx. 20th day)
• Embryo (approx. 28th day)
• Embryo (approx. 2nd month)

The first 8 models are enlarged approx. 4,000 times, the other 4 models are enlarged approx. 4-5 times. The first 8 stages can be removed from the baseboard for closer study. Delivered in storage carton.