All people with paralysis are different. For instance, my hands and my triceps (push muscle) are paralyzed, but I do have almost all my sense of touch and can push with my legs to lift my weight (even stand sometimes). I have a buddy who also has a c5/6 injury and has triceps, but less bicep function. There are many nerves in the neck. I broke my neck in a dirtbike accident and most of my damage was caused by the swelling.
ALSO, I spend all my time off-road and I try to reserve my shoulders for the important work so as not to wear them out. If I lose my arms, farming is off the table.