Hi again .....
Without having taken an anatomy class, the best I can do is refer you to a couple of web sites dealing with cranial nerves. Both the facial nerve and the trigeminal nerve originate at the brain stem and go to the face on each side. The trigeminal nerve is nerve V and the facial nerve is VII ...... the auditory nerve is VII. All of these are attached to the brainstem within a very small area, so it is a delicate area, especially when an unwanted tumor gets in the mix. Check these sites for different descriptions of each:
http://en.wikipedia.org/wiki/Cranial_nerves and
http://www.gwc.maricopa.edu/class/bio201/cn/cranial.htmNot being a trained medical person, I do not know whether "deep in the canal" is indicative of which it could be. However, if you do not have severe pain, my guess would be it is more likely facial in your case. If you have trigeminal neuralgia (which is pressure on nerve V at the brain stem), you would most likely be suffering electric shock type pain (like someone is putting a live wire to your face). I pray you do not have it.
From what others on this site have said (who have had facial nerve involvement pre-op), their pain often goes away after treatment. If we are being totally realistic, some patient's ANs are wrapped around the facial nerve and are "sticky" and difficult to remove without damage to the facial nerve. Unfortunately we have no fool-proof way to determine this prior to treatment.
I truly hope the above does not fall in the category of "too much information." I want to stress again how important it is to discuss your symptoms and fears with your AN doctor ..... who has your MRI results and history and is much better able to calm your fears than we are.
Please ask any and all questions of us here ..... no question is too small or silly. ..... and remember to keep us updated ..... for many of us the "worrying" never stops!
Clarice