Cranial Nerves

Question 1

What is CN 1

Answer 1

Olefactory nerve- the nerve for smell

Question 2

What us CN II

Answer 2

Optic nerve- nerve for vision-> transmits visual stimuli

Question 3

What is CN VIII

Answer 3

Vestibulocochlear nerve-> actually 2 nerves

Vestibular-> balance + equilibrium
Cochlear> the sense of hearing

Question 4

What is CN III?

Answer 4

Oculomotor nerve

Question 5

What is CN IV

Answer 5

Trochlear nerve

Question 6

What is CN VI

Answer 6

Abducens nerve

Question 7

What is CN XI

Answer 7

Accessory nerve

Question 8

What is CN XII

Answer 8

Hypoglossal nerve

Question 9

What is CN V

Answer 9

Trigeminal nerve

Question 10

What is CN VII

Answer 10

Facial nerve

Question 11

What is CN IX

Answer 11

Glossopharyngeal nerve

Question 12

What is CN X

Answer 12

Vagus nerve

Question 13

What is the Roman numeral for Olefactory nerve

Answer 13

CN I

Question 14

What is the Roman numeral for Optic nerve

Answer 14

CN II

Question 15

What is the Roman numeral for vestibulocochlear nerve

Answer 15

CN VIII

Question 16

What is the Roman numeral for the oculomotor nerve

Answer 16

CN III

Question 17

What is the Roman numeral for Trochlear nerve

Answer 17

CN IV

Question 18

What is the Roman numeral for the Abducens nerve

Answer 18

CN VI

Question 19

What is the Roman numeral for the accessory nerve

Answer 19

CN XI

Question 20

What is the Roman numeral for Trigeminal nerve

Answer 20

CN V

Question 21

What is the Roman numeral for Hypoglossal nerve

Answer 21

CN XII

Question 22

What is the Roman numeral for Facial nerve

Answer 22

CN VII

Question 23

What is the Roman numeral for the glossopharyngeal nerve

Answer 23

CN IX

Question 24

What is the Roman numeral for the vagus nerve

Answer 24

CN X

Question 25

What is the function of CN 1

Answer 25

Olefactory nerve-> cribiform plate of ethmoid bone-> nerve endings contain chemoreceptors which depolarize in response to chemicals in air breathed, the impulses are sent to the primary olfactory cortex in temporal lobe

Question 26

What is the function of CN II

Answer 26

Optic nerve-> this nerve is for vision, pathway; optic nerve-> optic chiasma (decussate)-> primary visual cortex in occipital lobe

Question 27

What is the function of the vestibulocochlear nerve?

Answer 27

CN VIII-> two separate nerves vestibular & cochlear Cochlear -> depolarize in response to sound waves -> hearing Vestibular-> depolarizes in response to body position -> balance and position

Question 28

What is the function of the oculomotor nerve?

Answer 28

CN III-> controls extrinsic and smooth muscles of the eye Has both somatic and visceral motor neurons Somatic: Moves eyeball (controls 4 of 6 of the muscles) Opens eye Visceral/Parasympathetic: Constriction of pupil Changing of Lens shape

Question 29

What is the function of CN IV

Answer 29

Trochlear nerve: moves the eyes medially & inferiorly by innervating the superior oblique muscle

Question 30

What is the function of the abducens nerve?

Answer 30

CN VI-> Turns eye laterally-> innervates the lateral rectus

Question 31

What is the function of CN V

Answer 31

Trigeminal nerve-> spilts into 3 branches at the Trigeminal ganglion - > opthalimic-> sensory function for forehead/nose (no motor function) - > maxillary-> sensory function over middle of face - > mandibular-> sensory function of chin and lateral parts of face-> motor axons innervate muscles of mastication (chewing) the temporalis and masseter

Question 32

What is the function of CN VII, what are the 5 branches?

Answer 32

Facial nerve-> sensory and motor (mixed) Motor: muscles of facial expression controlled by 5 branches -> temporal, zygomatic, buccal, mandibular, and cervical nerves Sensory: taste from anterior 2/3 of tounge (chemoreceptors) Parasympathetic: stimulation produces fluid: tears, saliva (submandibular gland, sublingual glands, lacrimal glands)

Question 33

What is the function of CN IX

Answer 33

Glossopharyngeal nerve-> sensory and Motor & parasympathetic Motor: controls muscles responsible for swallowing movements Parasympathetic: trigger salivation from the salivary gland called the parotid gland Sensory: supplies pharynx and back 1/3 of the tounge

Question 34

What cranial nerves are responsible for our ability to taste

Answer 34

CN IX-> glossopharyngeal nerve & CN VII-> facial nerve CN X- vagus nerve (taste sensation in pharynx)

Question 35

What is the function of the vagus nerve?

Answer 35

CN X-> main parasympathetic nerve-> innervates with throat and anterior neck as well as nearly all the thoracic & abdominal viscera Sensory neurons & motor neurons both somatic and visceral

Question 36

What is the function of CN XI

Answer 36

The accessory nerve-> motor nerves-> 2 portions-> cranial & spinal Cranial-> accompanies CN X/vagus and intervates certain muscles of larynx-> muscles of speech Spinal: controls sternocleidomastoid and trapezius

Question 37

What is the function of the hypoglossal nerve

Answer 37

CN XII Intervates the muscles of the tounge (no taste sensation)

Question 38

What cranial nerves are sensory?

Answer 38

I, II, VIII (1,2,8) Olefactory, optic, vestibulocochlear

Question 39

Which of the cranial nerves are motor nerves?

Answer 39

III, IV, VI, XI, XII (3,4,6,11,12) Oculomotor nerve , trochlear, abducens, accessory nerve, hypoglossal nerve

Question 40

Which of the cranial nerves are mixed?

Answer 40

V, VII, IX, X Trigeminal, facial, glossopharyngeal, vagus nerve

Question 41

What CN’s are innervated by the Parasympathetic nervous system

Answer 41

vagus-> viscera facial-> salivary, mucus, tear glands glossopharyngeal-> salivation (salty/acidic foods) oculomotor-> constrict eyes/ change lens shape

Question 42

What CN(s) would be affected for each? A) complete lost of taste sensation B) inability to move the tounge C) inability to move eyes in any direction D) loss of balance and equilibrium E) inability to close the jaw

Answer 42

A) VII & IX (facial and glossopharyngeal nerve) B) XII -> Hypoglossal nerve C) CN III, CN IV, CN VI D) CN VIII-> vestibular portion of the vestibulocochlear nerve E) CN V-> trigeminal nerve