CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
1. In the operat-
Short-latency, subcortical responses.
ing room, we
are mostly
con-cerned
with...
2. Why run BAEPs? To monitor the integrity of the auditory nerve, and often as a marker of
brainstem health,
3. Auditory Consists of classical lemniscal pathway and an extralemniscal pathway.
Path-way
Lemniscal pathway generates the short-latency BAEPs through series of
relay stations.
4. CN VIII Has an auditory portion and a vestibular portion, for which no monitoring
exists.
Intracranial portion of nerve runs in close proximity to CN VII
5. Synapse 1 of Cochlear nucleus
the Lemniscal
Path-way
6. Synapses of
Cochlear nucleus (bilateral response generated)
the Lemniscal
Path-way
Fibers exit cochlear nucleus and either cross the midline to the
contralateral superior olivary complex (SOC) or remain uncrossed and
project to the ipsilateral SOC.
SOC gives ott projections that travel to the inferior colliculus in a fiber tract
called the lateral lemniscus.
Projection from the inferior colliculus to the inferior colliculus of the
contralateral side.
1/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
Projection from the inferior
colliculus to the ipsilateral
medial geniculate nucleus
2/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
of the thalamus.
From thalamus, fibers travel as the auditory radiations to the auditory cortex
in the temporal lobe.
7. Tumors of CN VIII Acoustic neuroma, vestibular schwannoma, vestibular neuroma.
8. Posterior Places the brainstem at risk, therefore BAEPs are monitored to detect
Fossa
brainstem ischemia.
Craniotomy
Can pose a risk to CN VIII and is indicated in patients with disabling
9. Microvascular
tinnitus or positional vertigo.
Decompressio
ns (MVDs) BAEP monitoring should also be considered in procedures to relieve
trigeminal neuralgia (CN V), hemifacial spasm (CN VII), or
glossopharyngeal neuralgia (CN IX)
10. Brainstem BAEP is a useful monitor of brainstem health, but only directly assess a
and BAEPs small function of the brainstem.
11. Tumors of Most often indication for BAEP monitoring.
the
Cerebellar Usually involves monitoring of the lower CNs as well.
Pon-tine
Angle (CPA) The generator of Peak I has never been debated, but the generators of
the other peaks are debated.
12. Controversy
over Peaks
13. Peak I Generated in the distal auditory nerve.
14. Peak II Generated from the intracranial (proximal) portion of the auditory nerve.
15. Peak III The first that originates from the secondary neurons.
3/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
Generator is the caudal pontine tegmentum, which is also the generator
of the negative peak between III and IV (also known as IIIa)
4/
40
100% Verified Answers |Already Graded A+
1. In the operat-
Short-latency, subcortical responses.
ing room, we
are mostly
con-cerned
with...
2. Why run BAEPs? To monitor the integrity of the auditory nerve, and often as a marker of
brainstem health,
3. Auditory Consists of classical lemniscal pathway and an extralemniscal pathway.
Path-way
Lemniscal pathway generates the short-latency BAEPs through series of
relay stations.
4. CN VIII Has an auditory portion and a vestibular portion, for which no monitoring
exists.
Intracranial portion of nerve runs in close proximity to CN VII
5. Synapse 1 of Cochlear nucleus
the Lemniscal
Path-way
6. Synapses of
Cochlear nucleus (bilateral response generated)
the Lemniscal
Path-way
Fibers exit cochlear nucleus and either cross the midline to the
contralateral superior olivary complex (SOC) or remain uncrossed and
project to the ipsilateral SOC.
SOC gives ott projections that travel to the inferior colliculus in a fiber tract
called the lateral lemniscus.
Projection from the inferior colliculus to the inferior colliculus of the
contralateral side.
1/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
Projection from the inferior
colliculus to the ipsilateral
medial geniculate nucleus
2/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
of the thalamus.
From thalamus, fibers travel as the auditory radiations to the auditory cortex
in the temporal lobe.
7. Tumors of CN VIII Acoustic neuroma, vestibular schwannoma, vestibular neuroma.
8. Posterior Places the brainstem at risk, therefore BAEPs are monitored to detect
Fossa
brainstem ischemia.
Craniotomy
Can pose a risk to CN VIII and is indicated in patients with disabling
9. Microvascular
tinnitus or positional vertigo.
Decompressio
ns (MVDs) BAEP monitoring should also be considered in procedures to relieve
trigeminal neuralgia (CN V), hemifacial spasm (CN VII), or
glossopharyngeal neuralgia (CN IX)
10. Brainstem BAEP is a useful monitor of brainstem health, but only directly assess a
and BAEPs small function of the brainstem.
11. Tumors of Most often indication for BAEP monitoring.
the
Cerebellar Usually involves monitoring of the lower CNs as well.
Pon-tine
Angle (CPA) The generator of Peak I has never been debated, but the generators of
the other peaks are debated.
12. Controversy
over Peaks
13. Peak I Generated in the distal auditory nerve.
14. Peak II Generated from the intracranial (proximal) portion of the auditory nerve.
15. Peak III The first that originates from the secondary neurons.
3/
40
, CNIM - Brainstem Auditory Evoked Potentials Test with all Correct &
100% Verified Answers |Already Graded A+
Generator is the caudal pontine tegmentum, which is also the generator
of the negative peak between III and IV (also known as IIIa)
4/
40
