Ulnar nerve

Characteristic of ulnar nerve :

  • Has no branches above the elbow
  • Innervates the adductor pollicis muscle
  • Innervates the first dorsal interosseus muscle
  • Innervates the medial half of the flexor digitorum profundus (FDP)
  • Originates from the medial cord of the brachial plexus

More information of ulnar nerve :

The ulnar nerve is formed from the medial cord nerve roots of C7-T1.

Originating in the brachial plexus it descends down the arm before passing around the medial epicondyle of the elbow (the so-called funny bone) and then passes between the heads of flexor carpi ulnaris.

It gives some cutaneous branches just before the wrist whilst the motor branches pass around the hook of hamate.

Its motor contribution is to all small muscles of the hand except the lateral two lumbricals as well as FCU and FDP.

Its sensory supply is to the one and a half ulna side fingers.

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