Re: why does enjecting a sperm cell into a egg cell not result in fertilization

Hi Sara,

In fact, eggs CAN be fertilized by injecting sperm.  There is a new 
procedure called Intracytoplasmic Sperm Injection, or ICSI, and it's now 
used fairly routinely as a treatment for male infertility.  If you would 
like to learn more about ICSI, here are a few web sites which may be of 
interest:
 
http://www.advancedfertility.com/icsiimag.htm
(this one has photographs of the injection procedure)
 
http://www.ihr.com/westcoast/articles/icsi.html
(this one has a summary description of the procedure)
 
http://www.inciid.org/icsi.html
(for a more detailed summary of the procedure)