Following an incised wound in the front of wrist, the subject is unable to oppose the tips of the little finger and the thumb. The nerve (s) involved is are-
Opponens digiti minimi and opponens pollicis are both involved, as otherwise either of them will be able to oppose the thumb with the little finger if the other is paralysed. So it is clear that both median nerve and ulnar nerve is involved.
Ulnar nerve alone
Median nerve alone
Median and ulnar nerves
Radial and ulnar nerves