Figure 45. Position of hands and fingers

in ulnar paralysis of long standing: bird-claw hand; "Main en griffe"—(Duchenne.)—(Tyson.)
A. A. Wound of the ulnar nerve. B. B. B. B. B. Ends of the metacarpal bones. D. Tendons of the flexor sublimis digitorum. C. Muscles of the ball of the thumb.

This image is from Progressive Muscular Atrophy in Thomas' Eclectic Practice of Medicine.