Cranial Nerves And Electorde Placement

Question 1

First cranial nerve

Answer 1

Olfactory (sensory)

Question 2

Second cranial never

Answer 2

Optic (sensory)

Question 3

3rd cranial nerve

Answer 3

Oculomotor (motor)

Question 4

4th cranial nerve

Answer 4

Trochlear (motor)

Question 5

What does 4th cranial nerve do?

Answer 5

Eye movement, superior oblique muscle (up and down)

Question 6

Fifth cranial never

Answer 6

Trigeminal (opthalmic, maxillary and Mandibular)
Both

Question 7

Where to place electrodes to monitor trigeminal nerve

Answer 7

Forehead/temple- opthalmic branch
Cheeks- maxillary branch
Chin- mandibular branch

Question 8

Which branch of tirgmeinal is both sensory and motor and why’s this improtnsnt

Answer 8

Mandibular -> bite block

Question 9

6th cranial nerve

Answer 9

Abducens- motor

Question 10

Where to place electrodes to monitor 6th cranial nerve

Answer 10

Side of eyes (lateral eye movement)

Question 11

7th nerve

Answer 11

Facial (both)

Question 12

Where to place electrodes for facial nerve monitoring

Answer 12

Frontalis muscle (forehead)
Orbicularis oculi muscle (temple)
Orbicularis Oris muscle (above mouth)
Mentalis muscle (below mouth)
Ground on chest

Question 13

8th cranial nerve

Answer 13

Vestibulocochelar (sensory)

Question 14

Where to place electrodes for cranial nerve 8

Answer 14

In ears (clicking stimulation)

Question 15

Cranila mevre 9

Answer 15

Glossipharyngela (both)

Question 16

Where to place electrodes to monitor cranila nerve 9

Answer 16

Soft palate

Question 17

Cranila never 10

Answer 17

Vague (both)

Question 18

Where to place electrodes to monitor Cranila nerve 10

Answer 18

Endotracheal or endolaryngeal electrodes
-attaches to the intubation tube

Question 19

Cranila nerve 11

Answer 19

Accessory (motor)

Question 20

Where to place electrodes to monitor Cranila nerve 11

Answer 20

Trapezius and sternocloodmastoid muscle

Question 21

Cranial nerve 12

Answer 21

Hypoglossal (motor)

Question 22

Where to place electrodes to monitor Cranila nerve 12

Answer 22

Extra oral or intraoral on tongue

Question 23

Upper extremity sseps and where to place electrodes

Answer 23

Radial nerve- on thumb
Median nerve- thumb side
Ulnar nerve- pinky side

Question 24

Lower extremity sseps

Answer 24

Saphenous nerve- inner thigh and knee
Peroneal- top of foot and further up
Posterior tibial- inner ankle

Question 25

Corticobulbar tract

Answer 25

Originate from precentral gurus (primary motor cortex)
Goes down midbrain- synapse with CN 3,4,6
Through cerebral peduncles to the pons- synapse CN 5 and 7
Through medulla - synapse 9, 10, 11, 12

Question 26

Difference between lateral corticospinal and anterior corticospinal tract

Answer 26

Lateral- 90% decussate in medulla, used for skilled movements of hands and feet
Anterior- 10% do not cross in medulla, controls neck and trunk muscles

Question 27

What does corticobulbar tracts do

Answer 27

Movements of eyes tongue, chewing, expressions and speech