Upper trunk

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 cannot flex, Arm medially rotated, Forearm pronated, ‘waiter’s tip’, Loss of sensation over deltoid (C5) and lateral upper limb (C6).

单词	Superior trunk
释义	Superior trunk 英语百科 Upper trunk 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 cannot flex, Arm medially rotated, Forearm pronated, ‘waiter’s tip’, Loss of sensation over deltoid (C5) and lateral upper limb (C6).
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Superior trunk

Upper trunk