Middle trunk
Trunks · C7
The continuation of C7 alone. Like the lower trunk it gives no collateral branches — the upper trunk is the only trunk that branches — so it simply divides into anterior and posterior divisions.
Traced from the start
- C7 nerve root
- Middle trunk
Detail
- Motor
- Chiefly elbow extension and finger extension, through C7
- Sensory
- Middle finger
When it goes wrong
Isolated middle trunk injury (uncommon)
Weak elbow and finger extension, resembling a partial radial nerve palsy.
Practise this structure
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