Cranial Nerves

Question 1

the nervous system is broken into 2 parts:

Answer 1

1. CNS

2. PNS

Question 2

The PNS is broken into 2 parts:

Answer 2

1. afferent

2. afferent

Question 3

the PNS afferent pathway is broken into 2 parts:

Answer 3

1. somatic

2. visceral

Question 4

the PNS efferent pathway is broken into 2 parts:

Answer 4

1. somatic

2. visceral

Question 5

the PNS efferent visceral pathway is broken into 2 parts:

Answer 5

1. parasympathetic

2. sympathetic

Question 6

what are the 5 nerve fibers and what are they responsible for innervating?

Answer 6

1. GA- conscious sensation
2. VA- unconscious sensation
3. SA- special senses
4. GE- striated muscle
5. VE- smooth muscle

Question 7

(name and fiber): CN I:

Answer 7

OLFACTORY (SA)

Question 8

(name and fiber): CN II:

Answer 8

OPTIC (SA)

Question 9

(name and fiber): CN III:

Answer 9

OCULOMOTOR (GEVE)

Question 10

(name and fiber): CN IV:

Answer 10

TROCHLEAR (GE)

Question 11

(name and fiber): CN V:

Answer 11

TRIGEMINAL (GEGA)

Question 12

(name and fiber): CN VI:

Answer 12

ABDUCENS (GE)

Question 13

(name and fiber): CN VII:

Answer 13

FACIAL (GEVESA)

Question 14

(name and fiber): CN VIII:

Answer 14

VESTIBULOCOCHLEAR (SA)

Question 15

(name and fiber): CN IX:

Answer 15

GLOSSOPHARYNGEAL (GAVAVE)

Question 16

(name and fiber): CN X:

Answer 16

VAGUS (GEVE)

Question 17

(name and fiber): CN XI:

Answer 17

SPINAL ACCESSORY (GE)

Question 18

(name and fiber): CN XII:

Answer 18

HYPOGLOSSAL (GE)

Question 19

mnemonic for all 12 CN:

Answer 19

1. OSA
2. OSA
3. OGEVE
4. TGE
5. TGEGA
6. AGE
7. FGEVESA
8. VSA
9. GGAVAVE
10. VGEVE
11. SGE
12. HGE

Question 20

where does CN I exit the cranial cavity?

Answer 20

cribriform plate of the ethmoid bone

Question 21

where does CN II exit the cranial cavity?

Answer 21

optic

Question 22

where does CN III exit the cranial cavity?

Answer 22

SOF

Question 23

where do CN III’s nuclei originate?

Answer 23

midbrain at the level of superior colliculi

Question 24

where does CN IV exit the cranial cavity?

Answer 24

SOF

Question 25

where do CN IV exit the nuclei originate?

Answer 25

dorsal midbrain at the level of inferior colliculi

Question 26

where does CN IV nuclei exit?

Answer 26

dorsal midbrain (crosses over completely)

Question 27

where does CN V exit the cranial cavity?

Answer 27

V1: SOF V2: foramen rotundem V3: foramen ovale

Question 28

CN V has two types of nuclei - what are they and where are they located?

Answer 28

sensory nucleus: spans the length of the brain stem | motor nucleus: pons

Question 29

CN V nuclei exit where?

Answer 29

the brainstem at the lateral aspect of the pons

Question 30

where does CN VI exit the cranial cavity?

Answer 30

SOF

Question 31

CN VI nucleus is located where?

Answer 31

dorsal pons

Question 32

where does the CN VI nucleus exit?

Answer 32

brainstem at the pontomedullary junction

Question 33

where does CN VII exit the cranial cavity?

Answer 33

internal acoustic meatus

Question 34

where does CN VII travel

Answer 34

travels within facial canale of the petrous part of the temporal bone

Question 35

where are CN VII nuclei located

Answer 35

multiple nuclei located in the caudal pons

Question 36

where do CN VII nuclei exit?

Answer 36

brainstem at the pontomedullary junction (lateral to CN VI)

Question 37

where does CN VIII exit the cranial cavity?

Answer 37

internal acoustic meatus

Question 38

where does CN VIII stay?

Answer 38

within the petrous part of the temporal bone (does NOT leave skull)

Question 39

where are CN VIII nuclei located?

Answer 39

caudal pons and superior medulla

Question 40

where do CN VIII nuclei exit?

Answer 40

brainstem at the pontomedullary junction (inferior to CN VII)

Question 41

where does CN IX exit the cranial cavity?

Answer 41

jugular foramen

Question 42

where does the CN IX nucleus exit the brainstem?

Answer 42

lateral aspect of the rostral medulla

Question 43

where does CN X exit the cranial cavity?

Answer 43

jugular foramen (with CN IX)

Question 44

where does the CN X nucleus exit?

Answer 44

brainstem inferior to CN IX in the upper medulla

Question 45

where does CN XI exit the cranial cavity?

Answer 45

jugular foramen (CN IX and X)

Question 46

where does CN XI enter the skull?

Answer 46

foramen magnum

Question 47

T/F: originates only originates within the skull

Answer 47

F: CN XI originates both within the cranium and outside of the skull in the upper spinal cord (C1-C5)

Question 48

where does CN XII exit the cranial cavity?

Answer 48

hypoglossal canal and occipital bone

Question 49

where does the CN XII nucleus exit?

Answer 49

brainstem on the lateral aspect of the medulla

Question 50

how many nuclei does CN III have?

Answer 50

1. oculomotor nucleus (GE) | 2. Edinger -Westphal accessory nucleus (VE)

Question 51

CN III nuclei leave the midbrain and travel laterally to what artery?

Answer 51

posterior communicating artery

Question 52

T/F: CNIII nuclei travel through the body of the cavernous sinus

Answer 52

F: CNIII nuclei travel through the wall of the cavernous sinus