Nerve supply
- C7, C8, T1
- nerve picks up some branches of C7 from the lateral cord
Origin
- direct continuation medial cord
- runs between the brachial artery and the vein in the arm
- behind MCNFA
Arm
- pierces the medial intermuscular septum to run in posterior compartment
- runs anterior to the triceps
Elbow
- enters the cubital tunnel between the medial epicondyle and the olecranon
- running on MCL
- covered by osbourne's ligament
- gives articular branches to the elbow
Forearm
- runs between the two heads of FCU (anterior aspect medial epicondyle and proximal ulna)
- branches to (usually) medial 2 FDP and to FCU
- nerve descends on FDP, under the cover of FCU
Wrist
- nerve runs with the ulna artery to the wrist
- it emerges on the lateral aspect of FCU
- nerve is ulna to artery
- dorsal sensory branch which runs under FCU and supplies dorsum of hand in region of 1 and 1/2 fingers
- palmar cutaneous branch which supplies sensation over the hypothenar muscles
Guyon's canal
- superficial to TCL
- under volar carpal / pisohamate ligament
- between hook of hamate and pisiform
- nerve is ulna to the artery
- at the distal edge volar carpal ligament divides into a sensory and motor branch
Motor branch
- runs between abductor and flexor digiti minimi
- through opponens
- crosses the palm within the concavity of the deep palmar arch
- gives branches to the lateral 2 lumbricals, all the interossei and ends by supplying adductor pollicis