Cranial Nerves: Names and Numbers

Question 1

CN I

Answer 1

Olfactory

Question 2

CN II

Answer 2

Optic

Question 3

CN III

Answer 3

Oculomotor

Question 4

CN IV

Answer 4

Trochlear

Question 5

CN V

Answer 5

Trigeminal

Question 6

CN VI

Answer 6

Abducens

Question 7

CN VII

Answer 7

Facial

Question 8

CN VIII

Answer 8

Vestibulocochlear

Question 9

CN IX

Answer 9

Glossopharyngeal

Question 10

CN X

Answer 10

Vagus

Question 11

CN XI

Answer 11

Accessory

Question 12

CN XII

Answer 12

Hypoglossal

Question 13

CN I Function? s/m?

Answer 13

Smell. sensory only.

Only CN without thalamic relay to cortex!

Question 14

CN II: Function? S/M?

Answer 14

Sight. Sensory

Question 15

CN III. function? S/M?

Answer 15

eye movement (SR, IR, MR, IO). Motor only

Pupillary constriction via sphincter pupillae; Edinger-Westphal nucleus, muscarinic receptors.

Accomodation

eyelid opening (levator palpebrae)

Question 16

CN IV: function, s/m?

Answer 16

eye movement (SO). motor only

Question 17

CN V: function, s/m?

Answer 17

Mastication, facial sensation. Both

V1: Opthalmic

V2: maxillary

V3: mandibular

sensation from anterior 2/3 of tongue

Question 18

CN VI: function, s/m?

Answer 18

eye movement (LR). Motor

Question 19

CN VII: function, s/m?

Answer 19

Both

facial movement.

Taste from anterior 2/3 tongue

Lacrimation

Salivation(submandibular, sublingual)

Eyelid closing (orbicularis oculi)

Stapedius muscle in ear

Question 20

CN VIII: function, S/M?

Answer 20

Hearing, balance. sensory

Question 21

CN IX: function, S/M?

Answer 21

both

taste, somatosensation from posterior 1/3 tongue

swallowing

salivation (parotid only)

monitors carotid body and sinus chemo and baroreceptors

stylopharyngeus (elevates pharynx, larynx)

Question 22

CN X: function, S/M?

Answer 22

both

taste from epiglottic region

swallowing

soft palate elevation

midline uvula

talking

coughing

thoracoabdominal viscera

monitoring aortic arch chemo and baroreceptors

Question 23

CN XI: function, S/M?

Answer 23

motor

head turning

shoulder shrug (SCM, trapezius)

Question 24

CN XII: function, S/M?

Answer 24

motor

tongue movement

Question 25

Corneal reflex: afferent/efferent?

Answer 25

afferent: V1/opthalmic (nasociliary branch) Efferent: VII (temporal branch: orbularis oculi)

Question 26

Lacrimation reflex: afferent? efferent?

Answer 26

afferent: V1 (loss of this does not preclude emotional tears) efferent: VII

Question 27

Jaw jerk reflex: afferent? efferent?

Answer 27

afferent: V3 (sensory: muscle spindle from masseter) efferent: V3 (motor, masster)

Question 28

Pupillary reflex: afferent? efferent?

Answer 28

afferent: II efferent: III

Question 29

gag reflex: afferent? efferent?

Answer 29

afferent: IX efferent: X