Sea Urchin Embryology Back to Contents page






A 2cc syringe filled with 0.5M potassium chloride is inserted into the sea urchin between the teeth and the hard outer shell. A small amount of potassium chloride is injected into the urchin on each side (amount varies with size of urchin, 0.1cc/inch/side). This induces the urchin to spawn IF it has any eggs or sperm left.

WARNING: ONLY TEACHERS should do this. Potassium chloride is potentially lethal if used improperly.

Windows: Right click on animation and choose save to file

Macintosh: Hold click on animation and choose "save as"

© 1997 Chris Patton, Stanford University