Cranial Nerves

Question 1

Where does cranial nerve 1 enter the skull?

Answer 1

olfactory nerve - cribriform plate.

Question 2

Where does cranial nerve 6 exit the skull?

Answer 2

Abducens exits superior orbital fissure

Question 3

Where does vagus exit the skull?

Answer 3

CN X - Jugular foramen

Question 4

Where does the optic nerve exit the skull?

Answer 4

CN II - Optic canal

Question 5

Where does cranial nerve 3 exit the skull?

Answer 5

Oculomotor - Superior orbital fissure

Question 6

Where does the trochlear exit the skull?

Answer 6

CN IV - Superior orbital fissure

Question 7

What are the branches of trigeminal nerve called and whereto they exit the skull?

Answer 7

V1 - Ophthalmic - Superior Orbital Fissure
V2 - Maxillary - Foramen Rotundum
V3 - Mandibular - Foramen Ovale (sensory + motor)

Question 8

Where does cranial nerve 9 exit the skull?

Answer 8

Glossopharyngeal - Jugular foramen

Question 9

Where does cranial nerve 8 exit the skull?

Answer 9

Vestibulocochlear - Internal auditory meatus

Question 10

Where does cranial nerve 12 exit the skull?

Answer 10

Hypoglossal - Hypoglossal canal

Question 11

Where does facial nerve exit the skull?

Answer 11

CN VII - Internal Auditory Meatus

Question 12

Where does cranial nerve 11 exit the skull?

Answer 12

Accessory Spinal - Jugular Foramen

Question 13

what bone do the olfactory nerves pass through specifically

Answer 13

cribriform plate of ethmoid bone

Question 14

where do the olfactory nerves synapse

Answer 14

the olfactory bulb

Question 15

what is the name given to a loss of smell

Answer 15

anosmia

Question 16

why would you get a loss of pupillary construction if the optic never was damaged

Answer 16

because the light reflex requires light to reach the retina in order to send the impulses to the pretectal nucleus

Question 17

between which 2 cranial nerves do we switch from travelling round the cavernous sinus to just continuing in the posterior cranial fossa

Answer 17

cn 6 and 7

Question 18

what 2 muscles are innervated by the autonomic (paras) division of the oculomotor nerve

Answer 18

sphincter pupillae and ciliary muscle for accommodation of the lens

Question 19

why would ypu get ptosis with damage to the oculomotor nerve

Answer 19

because it innervates levator palpabrae superioris, so they struggle to keep their eye open

Question 20

an aneurysm in which 3 arteries can cause looking down and out of the eye?

Answer 20

so oculomotor nerve is affected. it comes out of the interprduncular fossa. 3 arteries around there are: posterior communicating artery, superior cerebellar and posterior cerebral.

Question 21

what name is given to the dural cavity that contains the trigeminal ganglion

Answer 21

the trigeminal cave

Question 22

what direction can’t your eye look in if the trochlear nerve is damaged

Answer 22

supplies superior obliques so can’t look down and in

Question 23

which root (sensory or motor) is larger for the trigeminal nerve

Answer 23

sensory

Question 24

what muscles does the trigeminal nerve innervate

Answer 24

muscles of mastication and levator and tensor too that affect the palate (?)

Question 25

the mucous membranes of the nasal and oral cavities get their general afferent sensation from which nerve, be specific

Answer 25

maxillary division, v2 of trigeminal

Question 26

what sinuses receive general sensory afferent fibres from the trigeminal nerve

Answer 26

all the paranasal sinuses, so frontal, ethmoidal, maxillary and sphenoidal

Question 27

what part of the trigeminal nerve does sensation to the palate

Answer 27

v2, maxillary

Question 28

what are the 4 muscles of mastication supplied by v3

Answer 28

medial pterygoid, lateral pterygoid, masseter and temporalis (tensor tympani and tensor veli palatini, mylohyoid and anterior belly of digastric)

Question 29

what gives sensation to the a.temporal region of the face. b.upper eyelid

Answer 29

a.v3 b.v1

Question 30

of you are unable to look down when the eye is adducted, why could you also lose sensation in your paranasal sinuses

Answer 30

the trochlear nerve is affected, so the superior orbital fissure. v1 also comes through here , so idd likely to also be damaged

Question 31

what nerve rubs inferolaterally to the internal carotid artery and so is easily affected by aneurysms

Answer 31

trochlear

Question 32

what nerve innervates the stapedius muscle and scala tympani

Answer 32

the facial nerve

Question 33

the visceral efferent fibres to salivary glands below the oral fissure is innervated by which nerve

Answer 33

the superior petrosal part of the facial nerve

Question 34

deeper parts of the auricle gets its general sensation from which nerve

Answer 34

facial nerve

Question 35

taste for anterior 2 3rds of the tongue is provided by which nerve

Answer 35

facial nerve

Question 36

posterior belly of digastric muscle and the stylohyoid muscle are innervated by which nerve

Answer 36

facial

Question 37

2 symptoms o facial nervr palsy

Answer 37

abnormal taste to anterior 2 3rds of the tongue and dry conjunctiva (autonomic secretion to lacrimal gland stopped by petrosal division)