In a complete section of the ulnar nerve at the wrist, disability of the hand results from the paralysis of

Interossei involve all digits hence produce complete disability. Hypothenar muscles are paralyzed but affect only the muscles of the little finger. Branches to FDP and FCU are given off in the forearm and hence intact in a wrist lesion.** Both interossei, hypothenar effected, question asks which causes more disability hence interosseiReference: Chaurasia; 6th edition