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Nerve Conduction studies Questions with Correct Answers.
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Nerve Conduction studies Questions with Correct Answers.
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Nerve Conduction studies Questions with CorrectAnswers
NCS can be performed on any accessible nerve including peripheral and
cranial nerves. Findings are basically twofold Correct Answer-How fast
is the impulse traveling? (i.e. how well is the impulse conducting)
What does the electrical representation of the nerve stimulation (action
potential morphology) look like on the screen.
EMG is different from NCS because Correct Answer-For clinical testing
you use a needle and put it into the muscle instead of electrodes that are
placed on the skin (although surface EMG is used in general lab
research, and this utilizes superficial electrodes)
You do not use any electrical shocks in EMG
You get direct information about the muscles in EMG and indirect
information about the nerves supplying that muscle.
EMG Correct Answer-Process by which the electrical activity of the
muscle is studied by insertion of a needle into the muscle.
The electrical activity comes from the muscle itself and no other shocks
are used to stimulate the muscle.
Orthodromic Correct Answer-when the electrical impulse travels in the
same direction as normal physiologic conduction (i.e. a motor nerve
conducts away from the spinal cord to the muscle. A sensory nerve
conducts from the muscle to the spinal cord.)
, Antidromic Correct Answer-when the electrical impulse travels in the
opposite direction of normal physiologic conduction.
Conduction velocity is directly related to Correct Answer-internodal
length and efficiency of myelin insulation
F-waves Correct Answer-Antidromic supramaximal stimulation. Not a
reflex.
Used to derive the conduction velocity of nerve between the limb and
spine.
Can indicate problems in the anterior horn of the spinal cord
H-reflex study Correct Answer-Antidromic stimulation (not
supramaximal)
uses stimulation of a nerve and recording the reflex electrical discharge
from a muscle in the limb.
Myelination Correct Answer-helps nerves propagate an action potential
faster.
functions as an insulator of the axon.
depolarization occurs only at areas devoid of myelin (nodes of Ranvier),
resulting in saltatory conduction.
demyelinated Correct Answer-myelinated nerve that has lost its myelin
covering.
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