Time Course of EMG/NCS Findings
Topic: Pharmacology
Created on Tuesday, January 16 2007 by
Last modified on Thursday, January 25 2007.
Sadly, you suffer from a painful abscess. Your brilliant but misunderstood surgeon recommends general anesthesia for an incision and drainage.
When you awaken, he proudly announces, "Congratulations! I have successfully severed your lower trunk of your brachial plexus!"
You are somewhat displeased.
When will your motor fibers waste away due to Wallerian degeneration?
A) 4 to 6 weeks B) 10 to 14 days C) 7 to 10 days D) 2 to 3 weeks E) Never
This question was created on January 16, 2007 by .
This question was last modified on January 25, 2007.
ANSWERS AND EXPLANATIONS
A) 4 to 6 weeks
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become (
See References)
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B) 10 to 14 days
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become (
See References)
|
| | |
| | |
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C) 7 to 10 days
This answer is correct.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become (
See References)
|
| | |
| | |
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D) 2 to 3 weeks
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become (
See References)
|
| | |
| | |
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E) never
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become (
See References)
|
| | |
| | |
Please log in if you want to rate questions. |
References:
1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. | |
2. Guarantors of Brain. (2000). Aids to the Examination of the Peripheral Nervous System, fourth edition. W.B. Saunders, Edinburgh. | |
3. Moore, K.L. (1992). Clinical Oriented Anatomy, 3rd Edition. Williams & Wilkins, Baltimore. | |
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pharmacology
Time Course of EMG/NCS Findings
Question ID: 01160700
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved.
Created: 01/16/2007
Modified: 01/25/2007
Estimated Permutations: 0