Cranial Nerves

Question 1

What goes through the optic canal

Answer 1

Optic nerve and opthalmic artery

Question 2

What goes through the carotid canal

Answer 2

ICA

Question 3

What goes through the foramen magnum

Answer 3

Spinal cord and vertebral artery

Question 4

Which CN do not arise from the brainstem

Answer 4

I and II olfactory and optic

Question 5

Functions of CN I and II (S/M/A)

Answer 5

Smell and vision

Question 6

Which CN from midbrain

Answer 6

Oculomotor and Trochlear

Question 7

Function of midbrain nerves

Answer 7

Eye movement

Question 8

Difference between oculomotor and Trochlear

Answer 8

Trochlear only involved in superior oblique

Question 9

Any autonomic functions of midbrain nerves

Answer 9

Dilates pupil focuses lens

Question 10

What are the three branches of the trigeminal nerves

Answer 10

Opthalmic
Maxillary
Mandibular

Question 11

Where does trigeminal nerve arose from

Answer 11

Pons

Question 12

CNV (S/M/A)?

Answer 12

All SA, M from Mandibular

Question 13

Where is sensation to trigeminal nerve from

Answer 13

V1- skin above eye and nasal cavity
V2- skin between eye and mouth
V3- temporal region and mandibular teeth and sensation at ear (auriculotemporal nerve)

Question 14

Automic innervation of CNV

Answer 14

V1-Dilates pupil
V2-Lacrimal, nasal, palatine,pharyngeal glands
V3- salivary galnds ( submandibular and sublingual)

Question 15

Where do CN VI-XII come from

Answer 15

Medulla

Question 16

Role of CN VI and what is it

Answer 16

Abducens- movement of eyeball
Lateral rectus

Question 17

CN VII name? (S/M/A)

Answer 17

Facial,
M- muscles of facial expression
S- taste and sensation at ear
A- Salivary and lacrimal glands

Question 18

Role of CN VIII

Answer 18

Vestibulocochlear- sensory, hearing and balance

Question 19

CN IX

Answer 19

Glossopharyngeal
S- oropharynx, middle ear, carotid body and sinus, posterior 1/3 tongue, gag reflex
M- stylopharyngeus
A- parotid gland

Question 20

CN X

Answer 20

S- Ear, larynx and pharynx Eg.auricular branch to ear
M- Pharynx and larynx egmsuperior pharyngeal constrictor
A- Heart and digestive organs

Question 21

CN XI

Answer 21

SCM and trapezius

Question 22

CN XII

Answer 22

Tongue movement (intrinsic tongue muscles etc., Speech, swallowing )

Question 23

Eye movements

Answer 23

Adduct- MR
Abduct- LR
Upward (O)- IO
Upward(I) - SR
Downward (O) - SO
Downward (I)- IR

Question 24

Parasympathetic innervation of CN III

Answer 24

sphincter pupillae to constrict pupil and ciliary muscles to shorten lens and focus on short range objects

Question 25

Parasympathetic innervation of CN VII

Answer 25

Mucosa of the oral and nasal cavities and pharynx produce mucous Lacrimal glands produce tears and submandibular and sublingual glands produce saliva

Question 26

PS innervation of CN IX

Answer 26

Parotid gland produces saliva

Question 27

PN innervation of CN X

Answer 27

Reduces resting heart rate and promoting smooth muscle contraction and secretion of digestive juices

Question 28

What is one LMN palsy

Answer 28

Bell's Palsy, idiopathic and mostly unilateral - affects facial nerve

Question 29

What causes hyperacusis

Answer 29

Non functional stapedius muscle

Question 30

What causes dry eye

Answer 30

Non functional orbicularis oculii

Question 31

What causes dribbling when eating

Answer 31

Loss of tone in facial muscles - buccinator in cheek, Obilcularis Oris

Question 32

What cause diplopia when looking at side ipsilateral to palsy

Answer 32

Problem with lateral rectus- abducens- (CNVI)

Question 33

Vertical diplopia, particularly noticeable on down gaze

Answer 33

Superior oblique, trochlear (CN IV)

Question 34

Ptosis, eye looks down when attempting to stare ahead

Answer 34

Problems with levator palpabrae superior is, inferior and medial rectus- and inferior oblique - oculomotor, III

Question 35

What nucleus in the thalamus is involved in vision

Answer 35

lateral geniculate nucleus

Question 36

Where do CN III and IV arise from

Answer 36

Ant and post midbrain respectively

Question 37

What two nerves involved in dilation of pupil

Answer 37

Opthalmic and Oculomotor

Question 38

Which three nerves are involved in AI to salivary glands

Answer 38

Mandibular and facial and glossopharyngeal

Question 39

Which two nerves are involved in AI to lacrimal glands

Answer 39

Maxillary and facial

Question 40

What three other glands does the Maxillary Nerve innervate

Answer 40

Nasal, palatine, pharyngeal

Question 41

What nerve innervates parotid gland

Answer 41

Glossopharyngeal

Question 42

What motor innervation does CN IX supply

Answer 42

Stylopharyngeus muscle