Cranial Nerves

Question 1

What is the modality of CN I?

Answer 1

Smell (special sensory)

Question 2

What is the cranial foramina of CN I?

Answer 2

Cribiform plate of ethmoid bone

Question 3

Where does CN I synapse?

Answer 3

Olfactory bulb

Question 4

What is the modality of CN II?

Answer 4

Vision (special sensory)

Question 5

What is the cranial foramina of CN I?

Answer 5

Optic canal

Question 6

Where does CN II connect with the CNS?

Answer 6

Diencephalon

Question 7

How can CN II be tested?

Answer 7

Acuity
Colour
Fields
Reflexes

Question 8

What are the modalities of CN III?

Answer 8

Motor (eye movement)
Pupil constriction (parasympathetic)

Question 9

What is the cranial foramina of CN III?

Answer 9

Superior orbital fissure

Question 10

Where does CN III connect with the CNs?

Answer 10

Midbrain

Question 11

Where does CN IV connect with the CNS?

Answer 11

Midbrain

Question 12

What is the cranial foramina of CN IV?

Answer 12

Superior orbital fissure

Question 13

Where does CN VI connect with the CNS?

Answer 13

Pontomedullary junction

Question 14

Within what structure does CN VI travel towards the orbit?

Answer 14

Cavernous sinus

Question 15

What is the cranial foramina of CN VI?

Answer 15

Superior orbital fissure

Question 16

What test can be used to test CNs III, IV and VI?

Answer 16

‘H’ test

Question 17

Axons from which structures form CN VIII?

Answer 17

Cochlear and vestibular

Question 18

What is the cranial foramina of CN VIII?

Answer 18

Internal acoustic meatus

Question 19

Where does CN VIII connect with the CNS?

Answer 19

Pontomedullary junction

Question 20

CN XI supplies which two muscles?

Answer 20

Sternocleidomastoid and trapezius

Question 21

Where does CN XI connect with the CNS?

Answer 21

Cervical spinal cord

Question 22

Describe the intracranial course of CN XI

Answer 22

Ascends through foramen magnum then travels toward jugular foramen

Question 23

What is the cranial foramina of CN XI?

Answer 23

Jugular foramen

Question 24

How can CN XI be tested clinically?

Answer 24

Ask patient to shrug shoulders and turn head to neck

Question 25

Where does CN XII connect to the CNS?

Answer 25

Via rootlets lateral to pyramids of medulla oblongata

Question 26

What is the cranial foramina of CN XII?

Answer 26

Hypoglossal canal

Question 27

Pathology of the right CN XII will cause the tongue to stick out in what direction?

Answer 27

Right

Question 28

What are the three divisions of CN V?

Answer 28

Ophthalmic (CN V1) Maxillary (CN V2) Mandibular (CN V3)

Question 29

What are the cranial foramina of CN V?

Answer 29

CN V1 - SOF CN V2 - foramen rotundum CN V3 - foramen ovale

Question 30

What is the sensory supply of CN V?

Answer 30

Face (CN V1 - top, CN V2 - middle and CV3 - bottom)

Question 31

What is the motor function of CN V3?

Answer 31

Jaw opening and closing

Question 32

Where does CN VII connect to the CNS?

Answer 32

Pontomedullary junction

Question 33

What is the cranial foramina of CN VII?

Answer 33

Internal acoustic meatus | Stylomastoid foramen

Question 34

How is the motor function of CN VII tested clinically?

Answer 34

Asking patient to raise eyebrows, close eyes, smile and puff out cheeks

Question 35

Where does CN IX connect with the CNS?

Answer 35

Medulla oblongata

Question 36

What is the cranial foramina of CN IX?

Answer 36

Jugular foramen

Question 37

What are the modalities of CN IX?

Answer 37

``` General sensory Special sensory Visceral afferent Somatic motor Parasympathetic ```

Question 38

Where does CN X connect with the CNS?

Answer 38

Medulla oblongata

Question 39

What is the cranial foramina of CN X?

Answer 39

Jugular foramen

Question 40

CN X runs within what structure in the neck?

Answer 40

Carotid sheath

Question 41

What branch is given off by CN X that supplies the laryngeal muscles?

Answer 41

Recurrent laryngeal nerve

Question 42

How can CN X be tested clinically?

Answer 42

Asking patient to say ahh Asking patient to swallow water Asking patient to talk

Question 43

Pathology of the right CN X will cause the uvula to pull to which side?

Answer 43

Left