Formation
- medial and lateral branches median nerve
- from medial and lateral cords respectively
- C5 - T1
- median branch crosses artery, such that median nerve lies lateral to artery
- no branches in arm
- medial nerve crosses brachial artery to lie medial to it
Elbow
- nerve medial to artery at elbow
- passes under bicipital aponeurosis then between heads of pronator teres
(sublime tubercle and CFO)
- medial nerve supplies PT, FCR, PL, FDS
AIN
- arises as pass between two heads PT from the dorsal aspect of median nerve
- occasionally passes deep to deep head of PT
- passes beneath arch of FDS
- runs distally along intra-oseous membrane between FDP & FPL
- branch to FDP / FPL ~ 4 cm distal to origin then branch to PQ
Median nerve
- runs under arch of FDS to run on FDP
- crosses the ulna artery
- at wrist it is lateral to FDS tendons, medial to FCR with PL above
- palmar cutaneous branch emerges on radial side of PL to run over TCL
Branches
1. Motor recurrent
- usually arises laterally
- sometimes comes off medial side and runs over distal edge of TCL (danger during endoscopic CTD)
- can pass through TCL
2. Medial sensory branch
- gives two common digital nerves
- motor to first 2 lumbricals
3. Lateral branch
- supplies thumb and lateral index finger