This is so doctors can administer the fetal tissue directly to the brain. There is already a medical treatment called surgical lesions that does just what I have described. Fetal tissue research exploits women by altering abortion techniques, because doctors need good tissue samples to use. This causes the least pain and danger to women. This means that the time it takes to perform an abortion is extended, and women are at a greater risk of danger.
Doctors are less concerned about the aborting woman, than the potential recipient of the tissue.
Fetal tissue research cannot justify abortion aby citing a benefit from it. The fact still remains that unborn babies are being killed and now what's left of their little bodies are being used in experiments in an attempt to preserve the lives of other. These babies don't get a say in either matter.