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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 tibialis anterior. Which of the following spinal root segments represents the minimum lesion required to cause this deficit?

A) L5 and S1

B) S1

C) L4

D) L3 and L4

E) L1 and L2

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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) L5 and S1

This answer is incorrect.

The L4 spinal segments are the segments which most strongly innervate the tibialis anterior. (See References)


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B) S1

This answer is incorrect.

The L4 spinal segments are the segments which most strongly innervate the tibialis anterior. (See References)


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C) L4

This answer is correct.

The tibialis anterior muscle is most strongly innervated by the L4 spinal segments. (See References)


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D) L3 and L4

This answer is incorrect.

The L4 spinal segments are the segments which most strongly innervate the tibialis anterior. (See References)


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E) L1 and L2

This answer is incorrect.

The L4 spinal segments are the segments which most strongly innervate the tibialis anterior. (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