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NBME 21 Answers

nbme21/Block 3/Question#30
A 41-year-old man comes to the physician ...
Abduction of the upper extremity🔍

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 +5  upvote downvote
submitted by mcl(447),

Deltoid is innervated by axillary nerve, which comes from roots C5/C6. Actions of the deltoid include abduction of the upper extremity.

seagull  I hope everyone memorized every single part of the brachial plexus and all the roots of each, No detail let untouched!!! +18  
mcl  In case anyone else has purged the whole brachial plexus from your memory (like me), this is a great resource linked by another user. https://geekymedics.com/nerve-supply-to-the-upper-limb/ +7  
zevvyt  I thought it was radial since he lost sensation in his thumb. If Radial is C5-T1, wouldn't that be included in C5-C6? +  

 +1  upvote downvote
submitted by poisonivy(19),

question #15553 in UW explains this one well. Basically, C5 branches innervate Deltoid (abduction) and Infraspinatus(external rotation) and C6 Biceps (forearm flexion), so the right option should be abduction of the upper extremity.

I got it wrong though lol

 -1  upvote downvote
submitted by burak(31),

It's like Erb Plays. Axillary, suprascapularis and musculocutaneous nerve damages.

burak  palsy* +  

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