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Figure 9: Froment's sign: The thumb adductor (adductor pollicis) is supplied by the ulnar nerve. In ulnar palsy, the patient compensates and prevents the card from slipping by flexing the thumb owing to median nerve innervated flexors (Flexor pollicis longus)

Figure 9: Froment's sign: The thumb adductor (adductor pollicis) is supplied by the ulnar nerve. In ulnar palsy, the patient compensates and prevents the card from slipping by flexing the thumb owing to median nerve innervated flexors (Flexor pollicis longus)