Descending medially through the cubital tunnel behind the medial epicondyle then through Guyon's canal at the wrist, supplying intrinsic hand muscles and the ring and little finger sensation.
Cubital tunnel syndrome is the most common entrapment after carpal tunnel syndrome, producing medial elbow pain and ring/little finger paraesthesia. Guyon's canal compression from cycling causes hypothenar weakness.
Medial elbow aching and ring/little finger paraesthesia from sustained flexion compression — managed with activity modification, splinting, or surgical decompression.
Handlebar pressure compressing the nerve between pisiform and hamate, producing hypothenar weakness or plantar sensory loss in the ring and little fingers.
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