Sea Urchin Embryology Back to Contents page

 

 

 

[ANIMATIONS][EXPERIMENTS]

NORMAL DEVELOPMENT

In normal development the sperm fertilizes the egg. The cortical reaction occurs raising the fertilization membrane and cell divisions occur until the blastula stage. When the embryo reaches the blastula stage the embryo releases an enzyme that dissolves the fertilization membrane and the young embryo swims free to continue development.
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© 1997 Chris Patton, Stanford University