Cranial Nerves

Question 1

Cranial nerves of midline

Answer 1

3, 6 and 12

Question 2

What 2 cranial nn. are not distributed to the head?

Answer 2

Vagus and accessory nn.

Question 3

Which cranial nn. conduct parasympathetic fibers?

Answer 3

3, 7, 9 and 10

Question 4

Cranial nerve I

Answer 4

Olfactory

Sensory

Question 5

Cranial nerve II

Answer 5

Optic

Sensory

Question 6

Cranial nerve III

Answer 6

Oculomotor

Motor

Question 7

Cranial nerve IV

Answer 7

Trochlear

Motor

Question 8

Cranial nerve V

Answer 8

Trigeminal

Both

Question 9

Cranial nerve VI

Answer 9

Abducens

Motor

Question 10

Cranial nerve VII

Answer 10

Facial

Both

Question 11

Cranial nerve VIII

Answer 11

Vestibulocochlear

Sensory

Question 12

Cranial nerve IX

Answer 12

Glossopharyngeal

Both

Question 13

Cranial nerve X

Answer 13

Vagus

Both

Question 14

Cranial nerve XI

Answer 14

Accessory

Motor

Question 15

Cranial nerve XII

Answer 15

Hypoglossal

Motor

Question 16

What nerve does not come from the brainstem?

Answer 16

CN I (olfactory) → comes from olfactory bulb

Question 17

CN I (olfactory) leaves the skull through?

Answer 17

Cribiform plate

Question 18

Which nerve is technically a tract?

Answer 18

CN II (optic n.)

Question 19

CN II (optic) connects?

Answer 19

Retina with diencephalon

Question 20

Vision pathway

Answer 20

1. Retina
2. Optic n.
3. Optic chiasm
4. Optic tract
5. Lateral geniculate nucleus
6. Optic radiation

Question 21

CN III (oculomotor) arises from?

Answer 21

Ventral aspect of mesencephalon

Question 22

Where do oculomotor GVE fibers synapse?

Answer 22

Ciliary ganglion

Question 23

Postganglionic oculomotor GVE fibers

Answer 23

Pass through ciliary nn. to supply ciliary and constrictor pupillae mm.

Question 24

3 clinical signs of oculomotor n. dysfunction?

Answer 24

1. Lateral strabismus
2. Ptosis of superior eyelid
3. Mydriasis

Question 25

Strabismus

Answer 25

Abnormal pointing of eye

Question 26

Ptosis

Answer 26

Drooping

Question 27

Mydriasis

Answer 27

Dilation of pupil

Question 28

Pupillary light reflex pathway

Answer 28

1. Retina 2. Optic n. 3. Optic chiasm 4. Optic tract 7. Pretectal nuclei 8. Parasympathetic nucleus of CN III 9. Ciliary ganglion

Question 29

CN IV (trochlear) arises from/

Answer 29

Dorsal aspect of mesencephalon

Question 30

Clinical signs of CN IV (trochlear) dysfunction

Answer 30

Extorsion of eye

Question 31

CN V (trigeminal) arises from?

Answer 31

Metencephalon

Question 32

Mandibular n. function

Answer 32

1. Sensory to inferior arcade, lip, tongue | 2. Motor to mm. of mastication (except cd. belly of digastricus)

Question 33

CN VI (abducens) arises from?

Answer 33

Myelencephalon

Question 34

Clinical signs of CN VI (abducens) dysfunction

Answer 34

Medial strabismus

Question 35

CN VII (facial) arises from?

Answer 35

Myencephalon

Question 36

How does VII (facial) give taste sensation to the rostral 2/3 of the tongue?

Answer 36

Via chorda tympani communication with lingual n.

Question 37

Parasympathetic fibers of CN VII (facial) go to

Answer 37

1. Lacrimal gland 2. Nasal gland 3. Palatine gland 4. Mandibular salivary gland 5. Sublingual salivary gland

Question 38

GVE fibers of CN VII (facial) go to the lacrimal, nasal and palatine glands via?

Answer 38

Pterygopalatine ganglion

Question 39

Only cranial nerve to originate from dorsal aspect of brain?

Answer 39

CN IV (trochlear)

Question 40

CN VIII (vestibulocochlear) arises from?

Answer 40

Myelencephalon near facial n.

Question 41

CN IX (glossopharyngeal) arises from?

Answer 41

Lateral aspect of myencephalon

Question 42

GVE fibers of CN IX (glossopharyngeal) supply?

Answer 42

Parotid and zygomatic salivary glands

Question 43

Vagus n. arises from?

Answer 43

Lateral aspect of myelencephalon (in line with glossopharyngeal n.)

Question 44

2 sensory ganglia associated with vagus n.

Answer 44

1. Proximal ganglion | 2. Distal ganglion

Question 45

What vagus fibers synapse at the cr. cervical ganglion?

Answer 45

Sympathetic

Question 46

What vagus fibers synapse at the distal ganglion?

Answer 46

Parasympathetic

Question 47

Proximal ganglion location

Answer 47

Jugular foramen (cannot be seen)

Question 48

Distal ganglion location

Answer 48

Caudal to the cr. cervical ganglion

Question 49

CN IX - XI exits cranial cavity via _____ and emerges from skull via _____

Answer 49

Jugular foramen, tympano-occipital fissure