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Lower extremity muscle function and innervation 2

Topic: Pharmacology

Created on Monday, September 18 2006 by

Last modified on Monday, September 18 2006.

A patient presents with weakness of the extensor hallucis longus. Which of the following spinal root segments represents the minimum lesion required to cause this deficit?

A) L3 and L4

B) S1

C) L1 and L2

D) L5 and S1

E) L2 and L3

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This question was created on September 18, 2006 by .
This question was last modified on September 18, 2006.

ANSWERS AND EXPLANATIONS

A) L3 and L4

This answer is incorrect.

The L5 and S1 spinal segments are the segments which most strongly innervate the extensor hallucis longus. (See References)


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B) S1

This answer is incorrect.

The L5 and S1 spinal segments are the segments which most strongly innervate the extensor hallucis longus. (See References)


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C) L1 and L2

This answer is incorrect.

The L5 and S1 spinal segments are the segments which most strongly innervate the extensor hallucis longus. (See References)


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D) L5 and S1

This answer is correct.

The extensor hallucis longus muscle is most strongly innervated by the L5 and S1 spinal segments. (See References)


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E) L2 and L3

This answer is incorrect.

The L5 and S1 spinal segments are the segments which most strongly innervate the extensor hallucis longus. (See References)


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References:

1. Guarantors of Brain. (2000). Aids to the Examination of the Peripheral Nervous System, fourth edition. W.B. Saunders, Edinburgh.


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pharmacology
Lower extremity muscle function and innervation 2
Question ID: 69182
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 09/18/2006
Modified: 09/18/2006
Estimated Permutations: 0