Cranial Nerves And Their Trsts

Question 1

What is CN 1 called and what is its function

Answer 1

Olfactory nerve
Sense of smell (sensory)

Question 2

What is CN 2 and what is its function

Answer 2

Optic
Vision (sensory)

Question 3

What is CN 3 and what is its function

Answer 3

Oculomotor
Motor to eye muscles to move eye medially and dilate pupil

Question 4

What is CN 4 and what is its function

Answer 4

Trochlear
Motor to eye muscle rotation

Question 5

What is CN 5 and what is its function

Answer 5

Trigeminal nerve (both)
Three branches;
- mandibullar (motor of jaw muscles/ chewing)
- maxillary (sensory)
- opthalmic (sensory)

Question 6

What is CN 10 and what is its function

Answer 6

Vagus nerve (both)
Parasympathetic supply
Sensory and motor to pharynx and larynx Parasympathetic to major internal organs

Question 7

What is CN 6 and its function

Answer 7

Abducens
Motor to eye muscles
Innervates lateral rectus muscle (moves eye laterally)

Question 8

What is CN 8 and its function

Answer 8

Vestobulocochlear- sensory
Hearing and balance

Question 9

What is CN 9 and its function

Answer 9

Glossopharengeal
Both
Sensory to tongue
Motor to larynx and pharynx

Question 10

What is CN 11 and its function

Answer 10

Accessory nerve
Motor to trapezius and 3 neck muscles

Question 11

What is CN 12 and its function

Answer 11

Hypoglossal nerve
Motor nerve
Tongue

Question 12

What is the test for CN 1

Answer 12

Walk past animal with sweets and see if they follow (don’t let them see)

Question 13

What is the test for CN 2

Answer 13

Menace response (not in first 14 days of life as it’s learnt)
Pupillary light reflex
Tracking an object

Question 14

What is the test for CN 3

Answer 14

Strabismus- check for normal alightment of the eye
Mydriasis- pupils can’t constrict so are dilated
Ptosis- can’t raise upper eyelid

Question 15

What is the test for CN 4

Answer 15

Tracking
Extend head and look for stabismus (abnormal alignment of the eyes)

Question 16

What is the test for CN 5

Answer 16

Check whether jaw is functioning and chewing is normal
jaw tone, muscle mass of jaw
Palpebral reflex- Check blink reflex (touch medial and lateral canthus which should cause blinking of eye)

Question 17

What is the test for CN 6

Answer 17

Corneal reflex
Strabismus

Question 18

What is the test for CN 7

Answer 18

Check for facial symmetry
Palpebral response
Menace test

Question 19

What is the CN 8 test

Answer 19

Vestibular eye drop test
BAER ( checks hearing of dog)
Check for nystagmus (crazy movement of eyes)

Question 20

What is the CN 9 test

Answer 20

Check Swallowing and watch eating
endoscopy

Question 21

What is the cranial nerve 10 test

Answer 21

Watch eating
Slap test (horses)
Bark
Endoscopy
Gag reflex
HR
BP

Question 22

What is CN 11 test

Answer 22

Watch eating
Watch neck movement

Question 23

What is the CN 12 test

Answer 23

Deviation of tongue to the side of the lesion
Do tongue retraction test

Question 24

Where does CN 1 leave the skull

Answer 24

Cribs canal

Question 25

Where does CN 2 leave the skull

Answer 25

Optic canal

Question 26

Where does CN 3 leave the skull

Answer 26

Orbital fissure

Question 27

Where does CN 4 leave the skull

Answer 27

Orbital fissure

Question 28

Where does the opthalmic branch of CN 5 leave

Answer 28

Orbital fissure

Question 29

Where does the maxillary branch of the CN 5 leave

Answer 29

Foramen rotundum

Question 30

Where does the mandibular branch of the CN 5 leave skull

Answer 30

Foramen ovals

Question 31

Where does the CN 6 leave the skull

Answer 31

Orbital fissure

Question 32

Where does the facial nerve leave the skull

Answer 32

Internal acoustic meatus

Question 33

Where does the CN 8 leave the skull

Answer 33

Internal acoustic meatus

Question 34

Where does CN 9 leave the skull

Answer 34

Jugular foramen

Question 35

Where does CN 10 exit the skull

Answer 35

Jugular foramen

Question 36

Where does CN 11 leave the skull

Answer 36

Jugular foramen

Question 37

Where does CN 12 exit the skull

Answer 37

Hypoglossal canal

Question 38

What muscles does oculomotor nerve innervate

Answer 38

Superior rectus Inferior rectus Medial rectus Inferior oblique

Question 39

What muscles are innervated by trochlear nerve

Answer 39

Superior oblique muscle

Question 40

What does the abductens nerve innervate

Answer 40

Lateral rectus \