Hi Mary,
I don't know exactly how to answer that question, becuase it has some layers to it. I can say that the electrodes are not placed where the nerve leaves the trigeminal ganglion. That is more inside the brain than out, and that surgery is called gasserian nerve stimulation, or something saying gasserian (why isn't my memory working? stupid question... could be gasserian root stimulation), and that would mean brain surgery. I've explored that route with my NS, he would not do it. It is, however, performed in Germany - I know someone who had it, who later had it removed due to infection.
So THAT I am clear on. I also know that there are 3 or 4 portals where the nerve comes through the skull and out into the tissue. The V1 and V2 ones are at the cheekbone, beside the nose, and a few different ones up at the eyebrow, and these spread branchlike throughout the face.
Now, what I don't know, is whether the neurosurgeon is shooting for these portals or not when he places the leads. Common sense would suggest that yes, these are what they are trying to hit with the electrodes - however, my NS has left me uncertain as to whether he is trying for these or not. He says that I have central pain syndrome, and the pain is as much a product of my mind at this point as it is of the nerve. This is not to suggest that it is psychosomatic. He says it's more like a pathway that gets worn into the ground with repeated footsteps, like a monk walking in a circle. The brain creates a closed loop of pain.
So, I do not mean to be confusing, and I do hope that someone has an answer to that question, because I would like the answer to it myself.
So, are they shooting for the nerves, or just the area that is ennervated?
Thanks bulliemom for that question.
Lily