Cranial nerves

Question 1

What is cranial nerve number I

Answer 1

Olfactory - cribiform plate

Question 2

What is cranial nerve number II

Answer 2

Optic - optic canal

Question 3

What is cranial nerve number III

Answer 3

Occulomotor - superior orbital fissure

Question 4

What is cranial nerve number IV

Answer 4

Trochlea - superior orbital fissure

Question 5

What is cranial nerve number V

Answer 5

Trigeminal
Opthalamic - superior orbital fissure
maxillary - fossa rotundum
mandibular - fossa ovale

Question 6

What is cranial nerve number VI

Answer 6

Abducens - superior orbital fissure

Question 7

What is cranial nerve number VII

Answer 7

Facial - Internal acoustic meatus

Question 8

What is cranial nerve number VIII

Answer 8

Vestibulocochlear - internal acoustic meatus

Question 9

What is cranial nerve number IX

Answer 9

Glossopharyngeal - jugular foramen

Question 10

What is cranial nerve number X

Answer 10

Vagus - jugular foramen

Question 11

What is cranial nerve number XI

Answer 11

Accessory - jugular foramen

Question 12

What is cranial nerve number XII

Answer 12

Hypoglossal - hypoglossal canal

Question 13

What is the pathway of cranial nerve I

Answer 13

Olfactory epithelium to the olfactory bulb

Question 14

What is the pathway of cranial nerve II

Answer 14

Retina to diencephalon

Question 15

What is the pathway of cranial nerve III

Answer 15

Midbrain to most of the eye muscles (not the superior oblique or lateral rectus)

Question 16

What is the pathway of cranial nerve IV

Answer 16

Midbrain to superior oblique

Question 17

What is the pathway of cranial nerve V

Answer 17

Opthalamic - Upper eyelid/face to pons
maxillary - Mid face to pons
Mandibular - Lower face to pons

Question 18

What is the pathway of cranial nerve VI

Answer 18

Pons to lateral rectus

Question 19

What is the pathway of cranial nerve VII

Answer 19

Pons to facial muscles

Question 20

What is the pathway of cranial nerve VIII

Answer 20

Inner ear to pons

Question 21

What is the pathway of cranial nerve IV

Answer 21

Medulla to carotid artery

Question 22

What is the pathway of cranial nerve V

Answer 22

Medulla to heart and pharynx and viscera

Question 23

What is the pathway of cranial nerve VI

Answer 23

Medulla/spinal cord to neck muscles and back

Question 24

What is the pathway of cranial nerve VII

Answer 24

Medulla to tongue

Question 25

Where do sensory nuclei lie

Answer 25

More laterally

Question 26

Where do motor nuclei lie

Answer 26

More medially

Question 27

Where do autonomic nuclei lie

Answer 27

In the middle of motor and sensory

Question 28

What is the function of cranial nerve I

Answer 28

Carries modality of smell | test by smelling something familiar

Question 29

What is the function of cranial nerve II

Answer 29

Vision - test by use of a reading chart

Question 30

What is the function of cranial nerve III

Answer 30

Movements of the eye - lifts up eyelids, rotates eyeball and constricts pupil - test by seeing if eyelids droop and does the pupil constrict at light

Question 31

What is the function of cranial nerve IV

Answer 31

Turns the eye (superior oblique) - Patient follows an H in the air

Question 32

What is the function of cranial nerve V

Answer 32

Test sensory portion - cotton wool on the face in areas in which they innervate Motor test - Ask them to clench their teeth

Question 33

What is the function of cranial nerve VI

Answer 33

Controls the lateral rectus muscle - test eye abduction

Question 34

What is the function of cranial nerve VII

Answer 34

Motor branches to muscles of facial expression Innervates submandibular and sub lingual glands. Provides taste to anterior 2/3 of tongue Test by raising eyebrows, scrunching eyes, showing teeth, puffing cheeks and closing eyes against resistance

Question 35

What is the function of cranial nerve VIII

Answer 35

Hearing and balance - use Rinne's and Weber test

Question 36

What is the function of cranial nerve IX

Answer 36

Sensory and motor to posterior 1/3 of tongue and pharynx Parasympathetic innervation of parotid gland Test by gag reflex

Question 37

What is the function of cranial nerve X

Answer 37

Motor supply to the pharynx and innervation to heart Sensory functions to pharynx, larynx and heart Ask the person to speak (Hoarseness in voice) also gag reflex

Question 38

What is the function of cranial nerve XI

Answer 38

Shrugging of shoulders - motor innervation to sternomastoid muscle and trapezius

Question 39

What is the function of cranial nerve XII

Answer 39

Movements of the tongue | Test by sticking out the tongue and moving it side to side