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Retired NBME 22 Answers

nbme22/Block 3/Question#20 (reveal difficulty score)
A 43-year-old man is brought to the emergency ...
Fibularis (peroneus) brevis ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +6  upvote downvote
submitted by โˆ—spow(50)
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Of all the options listed, there are two that function in eversion of the foot (and would cause this patient pain): the fibularis brevis and fibularis tertius.

At this point, NBME expects us to have some super asinine knowledge, but here's why (I think) the answer is brevis and not tertius. The brevis muscle runs over the lateral malleolus and therefore directly over this fracture. The tertius takes a different route into the foot, since it arises from the medial fibula and so it runs anterior to the lat malleolus and wouldn't cross the fracture site.

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 +3  upvote downvote
submitted by โˆ—dentist(94)
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the Fibularis Brevis is the only pure foot eversion muscle listed here. Everting his foot would exacerbate his injury and cause him more pain at the fracture

imo contraction of any of these muscles would be painful in this scenario

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weirdmed51  Due to its poor mechanical leverage, fibularis tertius can produce only two weak movements: Foot dorsiflexion around the talocrural (ankle) joint, with the help of extensor digitorum longus and tibialis anterior muscles. Foot eversion at the subtalar joint with the aid of fibularis longus and fibularis brevis muscles. +2



 +3  upvote downvote
submitted by โˆ—niboonsh(409)
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This link has good pictures as reference https://www.nielasher.com/blogs/video-blog/trigger-point-therapy-fibularis-peroneus-longus-brevis-tertius

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Though both peroneus brevis and tertius are foot evertors, peroneus tertius is an anterior compartment muscle, and peroneus brevis and longus are lateral compartment muscle.

+6/- apurva(101)


 +1  upvote downvote
submitted by โˆ—sweetmed(157)
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Heres a good image https://teachmeanatomy.info/lower-limb/muscles/leg/lateral-compartment/

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 +1  upvote downvote
submitted by โˆ—spow(50)
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Of all the options listed, there are two that function in eversion of the foot (and would cause this patient pain): the fibularis brevis and fibularis tertius.

At this point, NBME expects us to have some super asinine knowledge, but here's why (I think) the answer is brevis and not tertius. The brevis muscle runs over the lateral malleolus and therefore directly over this fracture. The tertius takes a different route into the foot, since it arises from the medial fibula and so it runs anterior to the lat malleolus and wouldn't cross the fracture site.

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 +0  upvote downvote
submitted by โˆ—an1(114)
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this helped a lot https://www.youtube.com/watch?v=vXI6Z0v8VkI

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