The
ulnar nerve supplies the flexor carpi ulnaris and the flexor digitorum profundus
of the ring and small fingers. In the hand it supplies all the muscles
except the first two lumbricals and the thenar muscles. It supplies
sensation to the small finger and half of the ring finger. Injury to the
ulnar nerve will result in different symptoms depending on whether the injury is
high in the arm, or low. 
Clinical
Example of Median and Ulnar Nerve Injury
The patient suffered a glass laceration to the
median and ulnar nerve in the forearm, along with transection of all the flexor
tendons. The median and ulnar nerve were microsurgically repaired.
At one year after nerve repair there is good thumb opposition and function of
the intrinsic muscles.
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