Sue,
It's just that the facial nerve stretches easily, or easier than the hearing nerve. Also, I think since all 3 nerves are right next to each other, it's very common for the AN to be touching all three. I could be wrong, please correct me someone if I am.
To my knowledge, the facial nerve doesn't stretch any more easily than the hearing nerve, if by "easily" you mean "more readily." The facial nerve
is more resilient than the hearing nerve, however, because it is a motor nerve and not a sensory nerve. That is, nerves that control motor functions send signals out from the brain to muscles and can take a lot of abuse (including being stretched) before they begin to malfunction. Sensory nerves like the hearing and balance nerves, on the other hand, respond to stimulus in the outside world and send electrical impulses
inward to the brain; they are much more sensitive to being stretched or compressed.
This explains why, even though an AN can be touching all three nerves in the IAC (facial, balance/vestibular, and hearing nerves), relatively few people have facial paralysis or paresis as their first AN symptom. (To be completely accurate, the vestibular nerve actually has two branches, the superior and inferior vestibular nerve, which run side-by-side inside the IAC.)
Best wishes,
Tumbleweed