Lower Limb Spinal Dermatomes - USMLE Forums
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USMLE Step 1 Mnemonics Mnemonics, acronyms, reminders, and memorizing tips for the USMLE Step 1.


 
 
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Old 09-10-2009
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Question Lower Limb Spinal Dermatomes

Yes they do ask about and to have a general outline will help a lot in the exam

Here's a quick tip

Just remember L2-L3 for anterior hip
and shift (with overlap) the numbers single segment for the next joint, so anterior knee will be L3-L4 and anterior ankle will be L4-L5

For the posterior innervation it's same as anterior but with downward shift (without overlap)
So posterior hip is L4-L5, posterior knee L5-S1, posterior ankle S1-S2
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Old 10-20-2009
 
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Awesome tip!Thank u Lee..
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Old 10-23-2009
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Default overlap

I thought there was an overlap for the posterior side where can I clarify this, to me in the kaplan dvd's the guy says there is an overlap

Last edited by jessp687; 10-23-2009 at 03:36 AM.
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Old 10-23-2009
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Quote:
Originally Posted by jessp687 View Post
I thought there was an overlap for the posterior side where can I clarify this, to me in the kaplan dvd's the guy says there is an overlap
I didn't say there's no overlap
Posterior Knee L5 S1
Posterior Ankle S1 S2

What I meant by the shift, is the shift in relation to the relevant anterior segments
Anterior Knee L3 L4
Posterior Knee L5 S1
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Old 10-25-2009
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To add on that, remember First Aid's mnemonic!

L4 down on all FOURS (knee).
L1 is IL (inverted = inguinal ligament)
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