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Sensory innervation of the upper extremity

Topic: Anatomy

Created on Friday, December 22 2006 by jdmiles

Last modified on Sunday, November 16 2008.

A 533 year-old Vitruvian male presents to your office, complaining of numbness in the region highlighted in red in the image below.
Of the following options, which nerve has a sensory distribution that best matches the region illustrated?

A) Axillary

B) Lateral antibrachial cutaneous

C) Median

D) Dorsal antibrachial cutaneous

E) Medial antibrachial cutaneous

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This question was created on December 22, 2006 by jdmiles.
This question was last modified on November 16, 2008.

ANSWERS AND EXPLANATIONS

A) axillary

This answer is incorrect.

The distribution of sensory innervation of the axillary nerve is shown in red in the image below:

(See References)


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B) lateral antibrachial cutaneous

This answer is incorrect.

The distribution of sensory innervation of the lateral antibrachial cutaneous nerve is shown in red in the image below:

(See References)


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C) median

This answer is incorrect.

The distribution of sensory innervation of the median nerve is shown in red in the image below:

(See References)


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D) dorsal antibrachial cutaneous

This answer is incorrect.

The distribution of sensory innervation of the dorsal antibrachial cutaneous nerve is shown in red in the image below:

(See References)


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E) medial antibrachial cutaneous

This answer is correct.

The following image illustrates the distribution of sensory innervation of some of the named nerves in the upper extremity.

(See References)


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References:

1. Gray, Henry. (1918). Anatomy of the human body 20th ed. Philadelphia: Lea & Febiger. (ASIN:B000TW11G6)

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anatomy
Sensory innervation of the upper extremity
Question ID: 810200601
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 12/22/2006
Modified: 11/16/2008
Estimated Permutations: 0