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NBME 21 Answers

nbme21/Block 1/Question#50

A photograph is shown of a myelin-stained cross ...

Loss of sensation to vibration over both feet

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 +2  upvote downvote
submitted by haliburton(64),

this is a cervical spinal cord section. the cuneate fasciculus is intact (UE) vibration and proprioception, but the white section is the gracile fasciculus (LE) and is damaged. I think the lateral portion that is uneven is just natural/artifact.

arezpr  thorax section +3  
guillo12  How do you know the gracile fasciculus is damage?!?! +  
cr  which parte of the image its damage?, the pink? or black? +  
usmile1  the pink park yes +1  
d_holles  If you look at https://en.wikipedia.org/wiki/Gracile_fasciculus#/media/File:Spinal_cord_tracts_-_English.svg you can see that the closer to the center = legs, while further away = arms. +1  

 +0  upvote downvote
submitted by ragacha(0),

PAGE 492 FA 2018 DAMAGE IN DORSAL COLUMN (funtion are: pressure, vibration, fine touch, proprioception) SYNAPSE 1 : N. graciLe ( Lower body, Legs) AND N. cUneatus (Upper body, arms)