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NBME 21 Answers

nbme21/Block 4/Question#50

A 19-year-old woman is brought to the emergency ...


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submitted by hungrybox(256),

The anatomic snuffbox is formed by the tendons of the extensor pollicis brevis, the abductor pollicis longus, and the extensor pollicis longus. (figure)

The floor is formed by the scaphoid bone, and it is here that one can palpate for a possible fractured scaphoid.

Source: Gray's Anatomy Review

hungrybox  Of note, the radial nerve innervates the extensors of the wrist. So the muscles of the anatomic snuffbox are all innervated by the radial nerve. +  
hungrybox  This helps you remember that the radial nerve innervates the abductor pollicis LONGUS (abductor pollicis BREVIS is median nerve, ADductor pollicis is the ulnar nerve. These two make sense if you think about the direction the thumb is moving - ending closer to the nerve.) +  

Lol uhhh also the scaphoid is literally fractured in the X-ray