Carpal Tunnel Versus Cervical Ridiculopaty?

Tests include tanell's test, where you tap on the palmer surface of the wrist. Ar your tapping right over the carpal tunnel. If they're not really getting a good blood supply and the trans membrane pumps aren't doing their job very well,. It's very easy, with just physical tapping, to de polarize the membrane and cause that shooting into the finger. And how on exam do you try to differentiate meof actually carpal tunnel versus a cervical ridigulopaty? It's hard to do on exam.