Spinal nerves exit through the openings between the vertebrae. C7
is the level at which the nerve that supplies the "absolute back" of
the arm (the actual elbow and the area aligned up and down with it) as
well as the middele and index fingers.
C8 is the level at which the nerves exit that supply your pinkie and
ring fingers as well as the area that is along the back of the arm
toward the center. So if your arm were held with the thumb away
from the body it would be the area that is closest to your body along
the entire arm. T1 is the location of the nerve that supplies the
inner or "front" part of the forearm, but doesn't affect the
fingers.
So although the surgeon will have to give you the odds about the
success of the surgery, it should be assumed that opening up these
areas will relieve pressure on the nerves and allow you to be pain
free.
Good luck with the surgery, I hope you get complete relief!
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