The ulnar nerve provides sensation to the little and ring fingers and activates many of the small muscles in the hand. The nerve passes behind the elbow where it can be felt and is referred to as the funny bone . The nerve gradually withers if the condition is not treated. This causes permanent loss of sensation and wasting of thumb muscles which cannot be relieved by surgery. The tendons that bend your fingers run through a tunnel or sheath.
Trigger finger is caused by a thickening on the tendon catching as it runs in and out of the sheath.
You can often feel this swelling in the palm as you move the finger. The system is very similar to bicycle brake cable. If the wire becomes bent or rusty, the brakes work badly. Relating to ulnar nerve. GuitarBase Articles-Cubital Tunnel Syndrome in Guitarists Cubital Tunnel Syndrome is also being experienced by interpreters.