CNIM Exam Questions With Correct Solutions | Latest Update Graded A+ (2023/2024)

Resting membrane potential is created by differences between the inside and outside of the cell in ion concentrations of 1. K+ 2. K+ and Ca++ 3. K+, Na+ and Cl4. Na+, Ca++ and Cl- - Answer K+, Na+, and ClExcitation of the postsynaptic neuron is caused by the neurotransmitter 1. gamma amino butyric acid 2. glycine 3. para amino butyric acid 4. glutamate - Answer Glutamate Wave III of the BAER is generated by the 1. superior olivary complex 2. inferior colliculus 3. lateral lemniscus 4. medial geniculate - Answer Superior olivary complex Lying between the adjacent surfaces of the vertebral bodies and bonding them together, are the 1. pedicles 2. intervertebral discs 3. supraspinous ligaments 4. spinal nerves - Answer Intervertebral discs Which of the following UE SSEP response is considered a "stationary potential" 1. N20 2. N13 3. P14 4. N18 - Answer N13 The initial waveform recorded of a near-field potential is 1. always obscured by stimulus artifact 2. negative due to depolarization of membrane potentials 3. positive due to electronic depolarization of the membrane under the recording electrode 4. of very low amplitude due to the significant distance between the generator and recording electrode - Answer Positive due to electrotonic depolarization of the membrane under the recording electrode Nerves of the body, such as the ulnar, median, and femoral, are formed from the 1. white matter of the spinal cord 2. dorsal and ventral rami 3. cervical spinal cord 4. ventral ganglion - Answer Dorsal and ventral rami On the SSEP, the electrode at ________ records a spinal cord response 1. T12 2. CPz 3. the iliac crest 4. the popliteal fossa - Answer T12 Projecting laterally from the junction of the pedicle and lamina and serving as a lever for muscle and ligaments, are the 1. intervertebral discs 2. mamillary processes 3. intervertebral foramen 4. transverse processes - Answer Transverse processes Synaptic transmission, and/or changes in the thalamocortical projections, are believed to produce 1. subcortical potentials 2. cortical potentials 3. the erb's point potential 4. the P100 potential - Answer Cortical potentials The section of the brainstem that is continuous with the spinal cord and includes the decussation of the pyramids, is the 1. medulla oblongata 2. pons 3. dorsal column 4. midbrain - Answer medulla oblongata The ulnar nerve originates from nerve roots at 1. C5-C6 2. C6-C7 3. C7-C8 4. C7-T1 - Answer C7-T1 The common peroneal nerve arises from the superior angle of the popliteal fossa of the 1. superior tibial nerve 2. superior femoral nerve 3. internal popliteal nerve 4. sciatic nerve - Answer Sciatic nerve The resting membrane potential of a neuron is 1. +20mV 2. +70mV 3. -20mV 4. -70mV - Answer -70mV The innermost connective tissue membrane covering the brain is the 1. dura 2. pia 3. arachnoid 4. falx cerebri - Answer Pia Which of the following can inhibit the postsynaptic neuron 1. gamma amino butyric acid 2. acetylcholine 3. para amino butyric acid 4. glutamate - Answer gamma amino butyric acid (GABA) The median nerve originates from nerve roots 1. C5- T1 2. C3-C7 3. C5-C6 4. C4-C6 - Answer C5-T1 An inhibitory transmitter causes the resting membrane potential of the post-synaptic neuron to 1. play a critical role in the development of the myelin sheath 2. be more negative 3. resist the effect of muscle relaxants 4. become hyperpolarized - Answer Become hyperpolarized The peroneal and tibial nerves are divisions of the 1. brachial plexus 2. deep peroneal nerve 3. sciatic nerve 4. lumbar plexus - Answer Sciatic nerve Cortical evoked potentials are largely produced by 1. depolarization propagated along the nerve fibers 2. actions potentials of the connecting axonal tracts 3. EPSPs and IPSPs 4. high energy magnetic fields of sodium ions within the cell membranes of the brain - Answer EPSPs and IPSPs 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 ASET CNIM Exam With Correct Solutions. 4. an important tool in assessing cochlear ischemia - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 ASET CNIM Exam With Correct Solutions. 4. horizontal resolution and signal size - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer the amplitude of the evoked response components to the amplitude of the unrelated components