Ulnar nerve
The arm nerve that serves the little-finger side of the hand; rope teachers list it among the nerves exposed on the inner arm above the elbow and at the wrist.
According to MedlinePlus, the ulnar nerve runs from the shoulder to the hand. Problems with it typically bring altered sensation in the little finger and part of the ring finger, weak or clumsy fingers, and sometimes pain, numbness or tingling. Listed causes include long-term pressure on the elbow or palm and prolonged or repeated bending of the elbow; compression at the elbow is called cubital tunnel syndrome. In rope teaching, the ESINEM Shibari Classes course names two places where the nerve is vulnerable: the little-finger side of the wrist, and the inner upper arm a short way above the elbow, where it lies exposed. The 2023 Cureus case series on rope bondage injuries, which centered on the radial nerve, did not record the ulnar nerve as a primary injury in its cohort.