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Variation of the branching pattern of the ulnar nerve in the Guyon canal. A, Bifurcation (66%-86%). B, Trifurcation (13%-22%). C, Trifurcation with communication between a proximal superficial branch and the ulnar proper palmar digital branch (<3%). D, High trifurcation (<3%). DB indicates deep branch; H, hamate; P, pisiform; SFB, superficial branch; UPDN, ulnar proper digital nerve; 4th CDN, fourth common digital nerve.
