Cranial Nerves

Question 1

List the cranial nerves

Answer 1

olfactory
optic
oculomotor
trochlear
trigeminal
abducens
facial
vestibulochochlear
glossopharyngeal
vagus
accessory 
hypoglossal

Question 2

Mnemonic for cranial nerves modality

Answer 2

sensory, motor or both (mixed)
CN I some
CN II say
CNIII money 
CN IV matters 
CN V but 
CN VI my 
CN VII brother 
CN VIII says 
CN IX big 
CN X boobs 
CN XI matter 
CNXII more

Question 3

CN I, the olfactory nerve, synapses in the thalmus (T/F)

Answer 3

False

-synapses in the olfactory bulb, continues as olfactory tract to the olfactory cortex

Question 4

Which cranial nerve arises from the spinal cord?

Answer 4

CN XI, spinal accessory nerve

Question 5

What are the functions of the Trigeminal nerve?

Answer 5

1. Sensation of the face
2. Proprioception of chewing
3. Motor control of mastication

Question 6

What are the functions of the Facial nerve?

Answer 6

1. Motor (muscles of facial ex[ression)
2. Taste to anterior 2/3 of tongue
3. Parasympathetics to submandibular and sublingual glands

Question 7

What are the functions of CN IX, glossopharyngeal nerve?

Answer 7

1. taste from posterior 1/3 of tongue

2. sensory from posterior tongue and upper pharynx

Question 8

Where are the solitary nucleus, salivatory nucleus and nucleus ambiguous located?

Answer 8

brainstem

Question 9

What faramina does the Olfactory nerve exit the cranium via?

Answer 9

Cribriform plate of the ethmoid

Question 10

Optic nerve exits the cranium through the _____

Answer 10

orbit

Question 11

How is the optic nerve tested?

Answer 11

acuity
Ishihara- colour vision
Visual fields
Pupillary reflexes
Fundoscopy

Question 12

Occuomotor nerve, trochlear nerve and the abducens nerve exit the cranium via the _____

Answer 12

superior orbital fissure

Question 13

Vestibulocochlear nerve exits the cranium via the ____ _____ ____

Answer 13

Vestibulocochlear nerve exits the cranium via the internal acoustic meatus

Question 14

How is CN VIII tested?

Answer 14

Rinnie and Weber test

Question 15

Spinal Accessory leaves the cranium via______

Answer 15

Spinal Accessory leaves the cranium via the foramen magnum

Question 16

How is CN XI tested?

Answer 16

shrug shoulders (trapezius)
turn head against resistnace (sternocleidomastoid)

Question 17

CN XII exits the cranium via the _____ _____

Answer 17

CN XII exits the cranium via the hypoglossal canal

Question 18

How is Hypoglossal nerve tested?

Answer 18

tongue movements

-tongue ‘points’ towards side of lesion

Question 19

CN V1 leaves the cranium via the ____, CN V2 via _____ and CN V3 via _____

Answer 19

CN V1 leaves the cranium via the superior orbital fissure, CN V2 via foramen rotundum and CN V3 via foramen ovale

Question 20

What nerve supplies the muscles of mastication (masseter, temporalis and pterygoids) and the tensor tympani muscle?

Answer 20

CN V3

Question 21

How does the facial nerve exit the cranium?

Answer 21

via the Internal acoustic meatus, followed by the stylomastoid foramen

Question 22

What does the facial nerve supply?

Answer 22

• taste to anterior 2/3 of tongue
• parasympathetics to submandibular and sublingual glands
• stapedius muscle
• muscles of facial expression

Question 23

Via what cranial foramen does the Glossopharyngeal nerve (CNIX) exit the cranium?

Answer 23

jugular foramen

Question 24

What does the glossopharyngeal nerve, CN IX, supply?

Answer 24

• parotid gland parasympathetics
• sensation and taste to posterior 1/3 of tongue
• carotid sinus and carotid body baro- and chemo-receptors
• sensory from pharynx, middle ear, eustachian tube, tonsils

Question 25

CN X exits the cranium via the _____

Answer 25

jugular foramen

Question 26

Muscles of the larynx are supplied by what nerve?

Answer 26

Recurrent laryngeal

-branch of vagus

Question 27

How is the vagus nerve tested?

Answer 27

1. say ‘aaah’ - look at uvula (points away from non-functioning side)
2. swallow water - watch larynx move
3. listen to speech - hoarseness?