Cranial Nerves III, IV, VI, and VII (F)

Question 1

What branches does CN VII give off after passing through the facial canal (and what do they innervate)?

Answer 1

1. stapedial nerve (to stapedius)
2. chorda tympani (taste to body of tongue)
3. greater superficial petrosal (para to lacrimal gland)
4. sensory branch to ear drum and canal

Question 2

Where does the CN VII exit the skull? 1. What does it pass through? 2. What does it then branch into? 3

Answer 2

1. sylomastoid foramen
2. parotid gland
3. temporal, zygomatic, buccal, mandibular, and cervical branches

Question 3

Where does the CN VII exit the skull? 1. What does it pass through? 2. What does it then branch into? 3

Answer 3

1. sylomastoid foramen
2. parotid gland
3. temporal, zygomatic, buccal, mandibular, and cervical branches

Question 4

What fiber types are in the motor fiber of CN VII? 1. In the Nervus intermedius? 2

Answer 4

1. SVE

2. SVA, GVE, GSA

Question 5

What does the superior vestibular of CN VIII innervate? 1. The inferior vestibular of VIII? 2

Answer 5

1. utricle, anterior semicircular canal, lateral semicircular canal
2. saccule, posterior semicircular canal

Question 6

What is the result to damage to the stapedial nerve off CN VII?

Answer 6

hyperacusia (sensitive to loud noises)

Question 7

Where does the chorda tympani of CN VII synapse? 1. What type of fiber is it? 2. What does it innervate? 3

Answer 7

1. submandibular
2. SVA of body of tongue
3. submandibular/sublingual glands

Question 8

What is different about the attachments of facial muscles compared to other types of skeletal muscles?

Answer 8

attach to skin,not bone

Question 9

Are surgical incisions on the face generally done parallel or perpendicular to the facial muscle orientation?

Answer 9

perpendicular

Question 10

About one in how many people develop Bells Palsy?

Answer 10

1 in 65

Question 11

About one in how many people develop Bells Palsy?

Answer 11

1 in 65

Question 12

About one in how many people develop Bells Palsy?

Answer 12

1 in 65

Question 13

What is the movement of one eye called?

Answer 13

duction

Question 14

What is the movement of two eyes in the same direction called?

Answer 14

version

Question 15

What is the movement of two eye in the opposite direction called?

Answer 15

vergence

Question 16

What happens to a patient with an SO palsy when their head is tilted to the side of the palsy?

Answer 16

supraduction of affect eye because SR fires without any cancellation in the form of infraduction from the SO

Question 17

What happens to a patient with an SO palsy when their head is tilted to the side of the palsy?

Answer 17

supraduction of affect eye because SR fires without any cancellation in the form of infraduction from the SO

Question 18

Where is the Parapontine Reticular Formation (PPRF) located in relation to CN VI? 1. What does it innervate? 2. If damaged, what is the result? 3

Answer 18

1. immediately ventral to VI nucleus
2. ipsilateral LR (VI) and contralateral MR (III)
3. cannot make voluntary eye movements to ipsilesional side. Involuntary still work

Question 19

Where is the Parapontine Reticular Formation (PPRF) located in relation to CN VI? 1. What does it innervate? 2. If damaged, what is the result? 3

Answer 19

1. immediately ventral to VI nucleus
2. ipsilateral LR (VI) and contralateral MR (III)
3. cannot make voluntary eye movements to ipsilesional side. Involuntary still work

Question 20

What is the head turn of a patient with LR palsy?

Answer 20

Turn head to same side