nerves innervating the muscles of the upper extremity

Topic: Anatomy

Created on Sunday, September 3 2006 by

Last modified on Sunday, September 3 2006.

 
        A) Opponens pollicis receives innervation from spinal segment C8.
 
        B) Brachioradialis receives innervation from spinal segment C1.
 
        C) Pectoralis major receives innervation from medial cutaneous nerve of the arm.
 
        D) Flexor digitorum profundus II receives innervation from axillary nerve.
 
        E) Brachialis receives innervation from median nerve.
 

 

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This question was created on September 03, 2006 by .
This question was last modified on September 03, 2006.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) opponens pollicis receives innervation from spinal segment C8.

This answer is correct.

The statement, "opponens pollicis receives innervation from spinal segment C8." is true.
opponens pollicis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) brachioradialis receives innervation from spinal segment C1.

This answer is incorrect.

The statement, "brachioradialis receives innervation from spinal segment C1." is false.
brachioradialis receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) pectoralis major receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.

The statement, "pectoralis major receives innervation from medial cutaneous nerve of the arm." is false.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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D) flexor digitorum profundus II receives innervation from axillary nerve.

This answer is incorrect.

The statement, "flexor digitorum profundus II receives innervation from axillary nerve." is false.
flexor digitorum profundus II receives innervation from median nerve, receives innervation from anterior interosseous nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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E) brachialis receives innervation from median nerve.

This answer is incorrect.

The statement, "brachialis receives innervation from median nerve." is false.
brachialis receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (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.
2. Moore, K.L. (1992). Clinical Oriented Anatomy, 3rd Edition. Williams & Wilkins, Baltimore.

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anatomy
nerves innervating the muscles of the upper extremity
Question ID: 683156834
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 09/03/2006
Modified: 09/03/2006
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