Are nerves seen on mri?

Yes, as long as..: ...you restrict the meaning of "nerve" to its proper definition of one of the large named peripheral nerves e.g. median, trigeminal, common peroneal; or the nerve ROOTS in the spinal canal; or the roots, trunks and cords of the brachial and lumbosacral plexuses. You can't see individual neurons or terminal branches such as nerve endings in the skin.