|Nerve: Upper trunk|
|Latin||truncus superior plexus brachialis|
The upper trunk (or superior trunk) is a trunk of the brachial plexus which derives from the C5 and C6 roots.
Damage to the upper trunk causes
- Arm hangs by side,
- Elbow can’t flex,
- Arm medially rotated,
- Forearm pronated,
- ‘waiter’s tip’,
- Loss of sensation over deltoid (C5) and lateral upper limb (C6).