When recording a TOF from the posterior tibial nerve at the ankle, which muscle would be best to record the response?
tibalis anterior
abductor hallucis
The best muscles for L4-S1 pedicle screw stimulation would be the:
tibialis anterior and gastrocnemius
vastus medialis and biceps femoris
The best muscle to record S-EMG for an S2-S4 instrumentation procedure is the:
tibialis anterior
anal sphincter
Which procedure may be done to reduce muscle spasticity?
selective dorsal root rhizotomy
mediolateral cordotomy
Which muscle is innervated by L4-S1 nerve roots?
iliopsoas
Which muscle is innervated by the C5 nerve root?
deltoid
pronator teres
Which muscle is innervated by the C7 nerve root?
triceps brachii
rectus abdominis
Which muscle is innervated by S2-S4 nerve roots?
gastrocnemius
When recording a TOF from the median nerve at the wrist, which muscle would be best to record the response?
abductor pollicus brevis
flexor carpi radialis
If there is traction on neural tissues during a surgery, it will result in:
train activity in EMG
delayed latency and a drop in amplitude for SSEP
What is the nerve innervation of the peroneus longus muscle?
L2, L3, L4
L5, S1 , S2
Stimulation of an L4 pedicle screw that has a lateral cortical bone breach will create a CMAP response in which muscle?
What is resected during a rhizotomy procedure?
dorsal rootlets
sensory nerve
When is a monopolar stimulator preferred over a bipolar stimulator
when localizing the general path of the nerve through a tumor
when localizing the nerve
Which type of s-EMG activity correlates with nerve injury and postoperative deficit?
burst activity
neurotonic discharges
If you observe s-EMG activity in all channels, it is probably due to:
nerve root irritation
the patient waking up
The pedicle screw stimulation probe should be plugged into which output of the stimulator box?
anode
cathode
A very high threshold for all pedicle screws could be because of a:
muscle relaxant
burst suppression
The release of a tethered cord is performed by the identifying and sectioning of the:
cauda equina
filum terminale
Stimulation of dorsal rootlets for dorsal root rhizotomy is done with a stimulation frequency of:
50.0 Hz
2.79 Hz
Luque rods would best be used for:
hip joint replacement
posterior spinal fixation
Lower motor neurons exit the spinal cord through the:
dorsal nerve roots
ventral nerve roots
The C8 nerve root exits the spinal cord at which level?
below the C8 vertebrae
above the T1 vertebrae
The tapered tip of the spinal cord is also known as the:
conus medullaris
Many nerve roots that exit at the lower part of spinal cord are called:
spina bifida
cauda equine
The ulnar nerve root entry level is:
C8-T1
C5-C8
The median nerve root entry level is:
C5-T1
The posterior tibial nerve root entry level is:
L4-S3
L3-S4
Tibial and common peroneal nerves are braches of the:
femoral nerve
sciatic Nerve
The integrity of a peripheral nerve can be determined by:
proximal CMAP responses
distal CMAP responses
What is the most appropriate drug to use at induction when monitoring s-EMG?
curare
succinyl-choline
A train activity may be seen by:
cold irrigation
warm irrigation
A metal artifact is seen when:
a metal instrument touches the nerve directly
two dissimilar metals touch each other in the exposed spine
What type of corrective force to the spinal column is applied when sublaminar wires are used?
fixation
translation
The effects of a Harrington rod distraction on the spinal cord can be tested by a:
stagnara wake up test
dorsal root stimulation
Which of the following is true for a possible nerve root injury when monitoring sEMG?
high frequency train firing lasting for more than one minute
few large bursts responses of complex morphology
The recommended band-pass filter for EMG monitoring is:
10-5000
10-30 to 16000
EMG monitoring for the S1 nerve root will include:
sartorius
A compression or sustained traction of a nerve will be present in s-EMG as:
train activity
The anterior horn cells are also called:
beta motor neurons
alpha motor neurons
There are _ cervical , _ thoracic, __ lumbar, and _ sacral spinal nerves in the human body.
7, 12, 5,5
8, 12, 5,5
Foot drop is caused by an injury to the:
peroneal nerve
If 3 out of 4 twitches are present during TOF monitoring, what percentage of muscles are paralyzed?
25%
75%
Wrist drop is caused by an injury to the:
median nerve
radial nerve
Radicular arteries can be compromised by:
derotation
pedicle screw fixation
the pudendal nerve arises from:
S2-S4
S1-S2
CMAP is a:
nerve action potential
myogenic response
Bipolar nerve stimulation is MORE:
sensitive
specific
Monopolar nerve stimulation is LESS:
A lumbar pedicle screw with a cortical bone breach will have a threshold of:
5 mA
20 mA