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ulnar nerve deep branch
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Test the ulnar nerve by asking the patient to spread their fingers apart while the examiner attempts to squeeze the index and little fingers together (this tests the dorsal interossei muscles and the abductor digiti minimi, along with FCU (flexor carpi ulnaris) being used as a synergist). The test for sensation of the ulnar nerve involves assessing sensation of the skin overlying the tip of the little finger.
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