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I need help about that.. Wat are the roots of both nerves? In Kaplan they mentions that the musculocutaneous nerve origin is c5, 6 and radial is c5-t1 then and 2 pages after they mentions that M.C nerve origin is c5, 6, 7 and radial is c5, 6, 7, 8 !! Can anyone explain what does it mean?
 

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According to Netter's Anatomy

According to Netter's
The radial nerve originates from the posterior cord of the brachial plexus with roots from C5, C6, C7, C8 & T1.
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis major, its fibers being derived from C5, C6 and C7.
 
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