Somatosensory Evoked Potentials
(SSEPs) Exam Questions With 100%
Verified Answers
What information does SSEPs provide? -
correct answer ✅Proprioception and vibration senses.
The electrical acitivy of the brain in response to touch
Where is the stimulus delivered and where are SSEPs recorded? -
correct answer ✅Delivered peripherally and recorded centrally in
the cortex
Is the sensory pathway afferent or efferent? Ascending or
descending? -
correct answer ✅Afferent and Ascending
Where are the 3 synapses for SSEPs? -
correct answer ✅1st: at the nucleus cuneatus/gracilis in the
midbrain
2nd: in the thalamus
3rd: in the primary somatosensory cortex
What is the pathway of the 1st order neuron? -
correct answer ✅1. Peripheral nerve stimulation (UN/PTN)
,Somatosensory Evoked Potentials
(SSEPs) Exam Questions With 100%
Verified Answers
2. Dorsal root ganglion
3. dorsal column in spinal cord (fasiculus cuneatus/gracilis)
4. Dorsal column nuclei in medulla (nucleus cuneatus/gracilis)
[Peripheral nerve --> medulla]
What is the pathway of the 2nd order neuron? -
correct answer ✅1. Dorsal column nuclei in medulla (nuclues
cuneatus/gracilis)
2. Decussation/Cross-over
3. Thalamus
What is the pathway of the 3rd order neuron? -
correct answer ✅1. Thalamus
2. Primary Somatosensory cortex
What is significant about the medial lemniscus? -
correct answer ✅Decussation/Cross-over
, Somatosensory Evoked Potentials
(SSEPs) Exam Questions With 100%
Verified Answers
Which extremities correspond with the fasciculus/nucleus gracilis
and cuneatus and what are their connecting points? -
correct answer ✅cuneatus: upper extremity, enters T6 of spinal
cord and up and has lateral distribution
gracilis: lower extremity with medial distribution
Think homunculus
What is the resting membrane potential? -
correct answer ✅-70mV
What is the process of an action potential? -
correct answer ✅begin at -70 and when reaches threshold of
excitement (-55) and will depolarize then, will continue to become
more positive until peak (+30), after will repolarize, after is a period
of hyperpolarization where it's more difficult to get an AP
(SSEPs) Exam Questions With 100%
Verified Answers
What information does SSEPs provide? -
correct answer ✅Proprioception and vibration senses.
The electrical acitivy of the brain in response to touch
Where is the stimulus delivered and where are SSEPs recorded? -
correct answer ✅Delivered peripherally and recorded centrally in
the cortex
Is the sensory pathway afferent or efferent? Ascending or
descending? -
correct answer ✅Afferent and Ascending
Where are the 3 synapses for SSEPs? -
correct answer ✅1st: at the nucleus cuneatus/gracilis in the
midbrain
2nd: in the thalamus
3rd: in the primary somatosensory cortex
What is the pathway of the 1st order neuron? -
correct answer ✅1. Peripheral nerve stimulation (UN/PTN)
,Somatosensory Evoked Potentials
(SSEPs) Exam Questions With 100%
Verified Answers
2. Dorsal root ganglion
3. dorsal column in spinal cord (fasiculus cuneatus/gracilis)
4. Dorsal column nuclei in medulla (nucleus cuneatus/gracilis)
[Peripheral nerve --> medulla]
What is the pathway of the 2nd order neuron? -
correct answer ✅1. Dorsal column nuclei in medulla (nuclues
cuneatus/gracilis)
2. Decussation/Cross-over
3. Thalamus
What is the pathway of the 3rd order neuron? -
correct answer ✅1. Thalamus
2. Primary Somatosensory cortex
What is significant about the medial lemniscus? -
correct answer ✅Decussation/Cross-over
, Somatosensory Evoked Potentials
(SSEPs) Exam Questions With 100%
Verified Answers
Which extremities correspond with the fasciculus/nucleus gracilis
and cuneatus and what are their connecting points? -
correct answer ✅cuneatus: upper extremity, enters T6 of spinal
cord and up and has lateral distribution
gracilis: lower extremity with medial distribution
Think homunculus
What is the resting membrane potential? -
correct answer ✅-70mV
What is the process of an action potential? -
correct answer ✅begin at -70 and when reaches threshold of
excitement (-55) and will depolarize then, will continue to become
more positive until peak (+30), after will repolarize, after is a period
of hyperpolarization where it's more difficult to get an AP
