ASET CNIM COMPREHENSIVE EXAMS ANSWERS
AND QUESTIONS SET A+
✔✔Spinal nerves are attached in series to the sides of the spinal cord and emerge
through the
1. filum terminale
2. lamina
3. spinous process
4. intervertebral discs - ✔✔Intervertebral foramina
✔✔The vestibulocochlear nerve (CN VIII) appears
1. in the groove between the pons and the medulla oblongata
2. between the cerebellum and C3
3. at the base of the brain near the optic nerves
4. from the floor of the third ventricle - ✔✔in the groove between the pons and medulla
oblongata
✔✔P14 is far-field, subcortically generated response which probably reflects
1. activity from the precentral gyrus
2. caudal medial lemniscal activity
3. passage of the afferent volley
4. a stationary cervical potential - ✔✔Caudal medial lemniscal activity
✔✔The facial nerve is cranial nerve _______ and it supplies the muscle for
____________
1. V, jaw movement
2. V, eye movement
3. VI, facial expression
4. VII, facial expression - ✔✔VII, facial expression
,✔✔The BAER measurement of the III-V interpeak interval represents
1. conduction through the upper-brainstem
2. conduction of the stimulus through the acoustic nerve
3. the time it takes for the sound to travel to the auditory cortex
4. an important tool in assessing cochlear ischemia - ✔✔Conduction through the upper
brainstem
✔✔A nerve cell membrane can depolarize when
1. sodium channels are closed and potassium channels are opened
2. the summation of individual action potentials exceeds the membrane threshold
3. the resting membrane threshold reaches -70mV
4. chloride channels are opened - ✔✔The summation of individual action potentials
exceeds the membrane threshold
✔✔In a normal adult, stimulation of the median nerve at the wrist will
1. elicit a primary cortical response at about 20msec
2. elicit an erb's point response at about 15msec
3. produce a visible twitch in the abductor hallucis muscle
4. elicit a cervical response at approximately 18msec - ✔✔elicit a primary cortical
response at about 20msec
✔✔Because generator sites are typically deep within anatomic structures, most EPs are
considered
1. far-field responses
2. multi-wave complexes
3. transient waveforms
4. steady state potentials - ✔✔Far-field responses
✔✔The posterior tibial nerve arises from which branch of the sciatic nerve
1. superior tibial
2. superior peroneal
3. internal popliteal
4. external popliteal - ✔✔superior tibial
✔✔A differential amplifier records
1. only the first two inputs
2. the second half the two inputs
3. the power of the sum of the two inputs
4. the difference between the two inputs - ✔✔the difference between the two inputs
,✔✔To accurately represent the amplitude of an EP waveform, a match must be made
between the
1. signal size and the vertical capacity of the digitizer
2. high-frequency noise and smoothing operation of the instrument
3. dwell time and sampling rate
4. horizontal resolution and signal size - ✔✔signal size and the vertical capacity of the
digitizer
✔✔Due to a smaller surface area, subdermal needle electrodes will have an impedance
that is
1. lower than disk electrodes
2. increased with improper insertion
3. improved by cleansing the skin with abrasive gel
4. higher than surface electrodes - ✔✔higher than surface electrodes
✔✔The difference between the voltages in input 1 and input 2 will make the display of
the amplifier move
1. in a sinusoidal pattern
2. up
3. either up or down
4. down - ✔✔either up or down
✔✔in order to stimulate both tibial nerves asynchronously, you need
1. to delay the first stimulator
2. to delay the second stimulator
3. a positive trace delay
4. a negative trace delay - ✔✔to delay the second stimulator
✔✔The input impedance of a differential amplifier must be at least
1. <5k ohms
2. 10 megohms
3. 100 megohms
4. <10 megohms - ✔✔100 megohms
✔✔An EP recording system should allow averaging of
1. 6,000 trials or more
2. no more than 500 trials
3. a maximum of 2,000 trials
, 4. at least 4,000 - ✔✔at least 4,000 trials
✔✔Signal-to-noise ratio relates to which of the following
1. the amplitude of the evoked response components to the amplitude of the unrelated
components
2. ability of the instrument to resolve data and noise vertically
3. two inputs of a differential amplifier with like negativity
4. sensitivity scaling - ✔✔the amplitude of the evoked response components to the
amplitude of the unrelated components
✔✔Electrode impedance is defined as opposition to
1. direct current flow
2. alternating current flow
3. differential current flow
4. 60 Hz artifact - ✔✔alternating current flow
✔✔A constant voltage stimulator
1. varies the current in order to maintain a preset voltage level
2. maintains a constant voltage of 100 volts
3. varies the output in order to maintain a preset current level
4. maintains a current level of 10mA - ✔✔varies the current in order to maintain a preset
voltage level
✔✔The sound stimulus intensity at the tympanic membrane depends on the
1. acoustic coupling between the sound stimulus generator and the ear
2. relation between SPL (dB) and the inverse peak equivalent SPL (dB)
3. relation between SPL (dB) and peak equivalent SPL (dB)
4. patients hearing threshold (dB) - ✔✔acoustic coupling between the sound stimulus
generator and the ear
✔✔For the intraoperative recording of EEG, the impedance of a scalp electrode should
range from
1. 250 - 500 ohms
2. 500 - 1,000 ohms
3. 1,000 - 5,000 ohms
4. 5,000 - 10,000 ohms - ✔✔1,000-5,000 ohms
✔✔The use of the 60hz notch filter is discouraged while recording because it can
1. produce a risk to the patient
AND QUESTIONS SET A+
✔✔Spinal nerves are attached in series to the sides of the spinal cord and emerge
through the
1. filum terminale
2. lamina
3. spinous process
4. intervertebral discs - ✔✔Intervertebral foramina
✔✔The vestibulocochlear nerve (CN VIII) appears
1. in the groove between the pons and the medulla oblongata
2. between the cerebellum and C3
3. at the base of the brain near the optic nerves
4. from the floor of the third ventricle - ✔✔in the groove between the pons and medulla
oblongata
✔✔P14 is far-field, subcortically generated response which probably reflects
1. activity from the precentral gyrus
2. caudal medial lemniscal activity
3. passage of the afferent volley
4. a stationary cervical potential - ✔✔Caudal medial lemniscal activity
✔✔The facial nerve is cranial nerve _______ and it supplies the muscle for
____________
1. V, jaw movement
2. V, eye movement
3. VI, facial expression
4. VII, facial expression - ✔✔VII, facial expression
,✔✔The BAER measurement of the III-V interpeak interval represents
1. conduction through the upper-brainstem
2. conduction of the stimulus through the acoustic nerve
3. the time it takes for the sound to travel to the auditory cortex
4. an important tool in assessing cochlear ischemia - ✔✔Conduction through the upper
brainstem
✔✔A nerve cell membrane can depolarize when
1. sodium channels are closed and potassium channels are opened
2. the summation of individual action potentials exceeds the membrane threshold
3. the resting membrane threshold reaches -70mV
4. chloride channels are opened - ✔✔The summation of individual action potentials
exceeds the membrane threshold
✔✔In a normal adult, stimulation of the median nerve at the wrist will
1. elicit a primary cortical response at about 20msec
2. elicit an erb's point response at about 15msec
3. produce a visible twitch in the abductor hallucis muscle
4. elicit a cervical response at approximately 18msec - ✔✔elicit a primary cortical
response at about 20msec
✔✔Because generator sites are typically deep within anatomic structures, most EPs are
considered
1. far-field responses
2. multi-wave complexes
3. transient waveforms
4. steady state potentials - ✔✔Far-field responses
✔✔The posterior tibial nerve arises from which branch of the sciatic nerve
1. superior tibial
2. superior peroneal
3. internal popliteal
4. external popliteal - ✔✔superior tibial
✔✔A differential amplifier records
1. only the first two inputs
2. the second half the two inputs
3. the power of the sum of the two inputs
4. the difference between the two inputs - ✔✔the difference between the two inputs
,✔✔To accurately represent the amplitude of an EP waveform, a match must be made
between the
1. signal size and the vertical capacity of the digitizer
2. high-frequency noise and smoothing operation of the instrument
3. dwell time and sampling rate
4. horizontal resolution and signal size - ✔✔signal size and the vertical capacity of the
digitizer
✔✔Due to a smaller surface area, subdermal needle electrodes will have an impedance
that is
1. lower than disk electrodes
2. increased with improper insertion
3. improved by cleansing the skin with abrasive gel
4. higher than surface electrodes - ✔✔higher than surface electrodes
✔✔The difference between the voltages in input 1 and input 2 will make the display of
the amplifier move
1. in a sinusoidal pattern
2. up
3. either up or down
4. down - ✔✔either up or down
✔✔in order to stimulate both tibial nerves asynchronously, you need
1. to delay the first stimulator
2. to delay the second stimulator
3. a positive trace delay
4. a negative trace delay - ✔✔to delay the second stimulator
✔✔The input impedance of a differential amplifier must be at least
1. <5k ohms
2. 10 megohms
3. 100 megohms
4. <10 megohms - ✔✔100 megohms
✔✔An EP recording system should allow averaging of
1. 6,000 trials or more
2. no more than 500 trials
3. a maximum of 2,000 trials
, 4. at least 4,000 - ✔✔at least 4,000 trials
✔✔Signal-to-noise ratio relates to which of the following
1. the amplitude of the evoked response components to the amplitude of the unrelated
components
2. ability of the instrument to resolve data and noise vertically
3. two inputs of a differential amplifier with like negativity
4. sensitivity scaling - ✔✔the amplitude of the evoked response components to the
amplitude of the unrelated components
✔✔Electrode impedance is defined as opposition to
1. direct current flow
2. alternating current flow
3. differential current flow
4. 60 Hz artifact - ✔✔alternating current flow
✔✔A constant voltage stimulator
1. varies the current in order to maintain a preset voltage level
2. maintains a constant voltage of 100 volts
3. varies the output in order to maintain a preset current level
4. maintains a current level of 10mA - ✔✔varies the current in order to maintain a preset
voltage level
✔✔The sound stimulus intensity at the tympanic membrane depends on the
1. acoustic coupling between the sound stimulus generator and the ear
2. relation between SPL (dB) and the inverse peak equivalent SPL (dB)
3. relation between SPL (dB) and peak equivalent SPL (dB)
4. patients hearing threshold (dB) - ✔✔acoustic coupling between the sound stimulus
generator and the ear
✔✔For the intraoperative recording of EEG, the impedance of a scalp electrode should
range from
1. 250 - 500 ohms
2. 500 - 1,000 ohms
3. 1,000 - 5,000 ohms
4. 5,000 - 10,000 ohms - ✔✔1,000-5,000 ohms
✔✔The use of the 60hz notch filter is discouraged while recording because it can
1. produce a risk to the patient
