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C6
47%
45/95
Upper trunk
5%
5/95
Middle trunk
6%
6/95
Posterior cord
4%
4/95
Lateral cord
37%
35/95
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The lateral cord terminates as the musculocutaneous nerve and also contributes sensory fibers to the median nerve. Involvement of the C6 root or upper trunk could potentially cause weakness of the infraspinatus and the brachioradialis. The middle trunk and the posterior cord do not contribute motor fibers to the thumb or sensory fibers to the thumb.
1.9
(34)
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