Upper trunk

Upper trunk

Infobox Nerve
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Latin = truncus superior plexus brachialis
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DorlandsPre = t_20
DorlandsSuf = 12826113
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).

The musculocutaneous and median nerves derive largely from this trunk.


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