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Retired NBME 27 Answers

nbme27/Block 4/Question#46 (reveal difficulty score)
A 25-year-old woman is brought to the ...
C5-7 ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—shak360(19)
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Axillary (C5-6) injuries are caused by a fractured surgical neck of the humerus or an anterior dislocation of the humerus. It causes a

  • flattened deltoid
  • loss of arm abduction at the shoulder from 15ยบ-100ยบ (recall that 0ยบ to 15ยบ is done by the supraspinatus via the suprascapular nerve)
  • loss of sensation over the deltoid and lateral arm

Musculocutaneous (C5-7) injuries are caused by upper trunk compressions and result in

  • reduced biceps (C5-6) reflex
  • weakness of forearm flexion and supination
  • loss of sensation over the lateral forearm
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