Table 1.

Tests for ulnar nerve motor function.

Muscle	Test Instructions	Positive Sign
FCU	Flex wrist in ulnar direction against resistance	Weakness
FDP	Flex DIP of the small finger against resistance	Weakness
Abductor digiti minimi	Abduction of small finger against resistance	Weakness
1st dorsal interosseous	Index finger abduction against resistance	Weakness
Adductor pollicis	Pinch a piece of paper between the thumb and index finger	Froment's sign: IP joint will flex
3rd palmar interosseous/small finger lumbricals	Adduct all fingers	Wartenberg's sign: Small finger begins to abduct relative to other digits