cranial nerves

Question 1

What is the name of Cranial Nerve I? What does it do? What source in CNS?

Answer 1

Olfactory, special sense of olfaction

Forebrain

Question 2

What is the name of Cranial Nerve II? What does it do? What source in CNS?

Answer 2

Optic
Special sense of vision
Forebrain

Question 3

What is the name of Cranial Nerve III? What does it do? What source in CNS?

Answer 3

Occulomotor
Motor: to Extraocular Muscles: superior, inferior and medial rectus, inferior oblique, and levator palpebrae superioris muscles
Raises eyelid

Midbrain

Question 4

What is the name of Cranial Nerve IV? What does it do? What source in CNS?

Answer 4

Trochlear
Motor to extraocular muscle: superior oblique
moves eye down when looking towards nose, rotates eye internally
Midbrain

Question 5

What is the name of Cranial Nerve V(1)? What does it do? What source in CNS?

Answer 5

Trigeminal Opthalmic:
Sensory to cornea, skin of forehead, scalp, eyelids, nose, mucosa of nasal cavity and paranasal sinuses
Pons

Question 6

What is the name of Cranial Nerve VI?What does it do? What source in CNS?

Answer 6

Abducens
Motor to extraocular muscle, larteral rectus
Abducts eye
Pons

Question 7

What is the name of Cranial Nerve VII? What does it do? What source in CNS?

Answer 7

Facial
Special sense of taste to anterior 2/3 of tongue
Sensory to skin of ear
Motor to muscles of facial expression, salivary, nasal, and lacrimal
Pons

Question 8

What is the name of Cranial Nerve VIII? What does it do? What source in CNS?

Answer 8

Vestibulocochlear
Special sense of hearing and balance
Pons

Question 9

What is the name of Cranial Nerve IX? What does it do? What source in CNS?

Answer 9

Glossopharygneal
Special sense of taste to posterior 1/3 of tongue
Sensory to posterior tongue, middle ear, pharynx, carotid body carotid sinus
Motor: stylopharyngeus muscle, parotid gland
Medulla

Question 10

What is the name of Cranial Nerve X? What does it do? What source in CNS?

Answer 10

Vagus
Special sense of taste to epiglottis
Sensory to external ear, pharynx, larynx, thoracic and abdominal organs
Motor to thoracic and abdominal organ, muscles of pharynx and larynx
Medulla

Question 11

What is the name of Cranial Nerve XI? What does it do? What source in CNS?

Answer 11

Spinal Accessory
Motor to trapezius and sternocleidomastoid
Medulla

Question 12

What is the name of Cranial Nerve XII? What does it do? What source in CNS?

Answer 12

Hypoglossal
Motor to tongue
Medulla

Question 13

What is the name of Cranial Nerve V(2)? What does it do?

Answer 13

Trigeminal Maxillary:
Sensory to skin over maxilla, inculding upper lip, maxillary teeth, mucosa of nose, maxillary sinuses and palate
Pons

Question 14

What is the name of Cranial Nerve V (3)? What does it do?

Answer 14

Trigeminal Mandibular:
Sensory to skin of face overlying mandible including lower lip, mandibular teeth, temporomandibular joint, mucosa of mouth and anterior two thirds of tongue.

Motor to muscles of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, and tensor tympani.
muscles of mastication
Pons

Question 15

Where does CN I/Olfactory exit?

Answer 15

Foramina of cribiform plate

Question 16

Where does CN II/Optic exit?

Answer 16

Optic Canal

Question 17

Where does CN III/Occulomotor exit?

Answer 17

Superior Orbital Fissure

Question 18

Where does CN IV/Trochlear exit?

Answer 18

Superior Orbital Fissure

Question 19

Where does CN V1/Trigeminal Opthalamic exit?

Answer 19

Superior Orbital Fissure

Question 20

What 4 CN nerves exit the Superior Orbital Fissure?

Answer 20

Occulomotor CNIII
Trochlear CNIV
Trigeminal Opthalamic CNV1
Abducens CNVI

Question 21

Where does CN V2/Trigeminal Maxillary exit from?

Answer 21

Foramen Rotundum

Question 22

Where does CN V3/Trigeminal Mandibular exit from?

Answer 22

Foramen Ovale

Question 23

Where does CN VI/Abducens exit from?

Answer 23

Superior Orbital Fissure

Question 24

Where does CNVII/Facial exit from?

Answer 24

Internal Auditory Meatus

Stylomastoid Foramen

Question 25

Where does CNVIII/Vestibulocochlear exit from?

Answer 25

Internal Auditory Meatus

Question 26

What 2 two nerves exit from the Internal Auditory Meatus?

Answer 26

Facial CNVII | Vestibulocohclear CNVIII

Question 27

Wheres Glossopharyngeal/CNIX exit from?

Answer 27

Jugular Foramen

Question 28

Where does CNX/Vagus exit from?

Answer 28

Jugular Foramen

Question 29

Where does CNX1/Spinal Accessory exit from?

Answer 29

Jugular Foramen

Question 30

What 3 nerves exit at the jugular foramen?

Answer 30

Glossophyrangeal CNIX Vagus CNX Spinal Accessory CNXI

Question 31

Where does Hypoglossal/CNXII exit from?

Answer 31

hypoglossal canal

Question 32

What comes out of stylomastoid foramen

Answer 32

Motor components of facial nerve

Question 33

What comes out of stylomastoid foramen?

Answer 33

Motor components of facial nerve

Question 34

What are the 5 special senses?

Answer 34

``` sight audition and balance smell taste touch ```

Question 35

What cn nerve is responsible for the special sense of light being transduced onto the optic nerve?

Answer 35

CNII Optic

Question 36

What are deficits associated with loosing CNII (special sense)?

Answer 36

accomodation dysfunction oculomotor dysfunction visual agnosia

Question 37

What are symptoms associated with loss of the special sense of sight?

Answer 37

abnormal posture balance deficit loss of depth perception diplopia

Question 38

What CN has the special sense of pitch, timing, amplitude, and the utricle, saccule, and semicircular canals?

Answer 38

CNVIII: vestibulococchlear

Question 39

What are deficits associated with the loss of CNVIII?

Answer 39

acoustic neuroma otitis media noise exposure

Question 40

What are symptoms of the loss of CNVIII

Answer 40

tinnitis vertigo hearing loss muscle atrophy

Question 41

What special sense and CN is associated with damage to the olfactory bulb?

Answer 41

Smell and is related to taste->retronasal olfaction | CNI: olfactory

Question 42

What are deficits associated with the loss of CNI?

Answer 42

anosmia sinus infection traumatic head injury

Question 43

What are symptoms that the olfactory bulb/CNI has been damaged?

Answer 43

precursor to Parkinsons | Secondary to other disorders

Question 44

What three nerves are associated with the special sense of taste?

Answer 44

CNII: Facial CNIX: Glossopharngeal CNX: Vagus

Question 45

What are the 5 tastes?

Answer 45

``` salty sweet sour bitter umami ```

Question 46

What are symptoms that someone may have damaged CNVII, IX, and/or X?

Answer 46

nutritional deficits | weight loss

Question 47

Where is the special sense of touch located?

Answer 47

mechanoreceptors in skin that feed to the spinal cord

Question 48

What are some deficits that could cause someone to lose their sense of touch?

Answer 48

stroke/trauma neuropathy radiculopathy myelopathy

Question 49

What are symptoms of spinal cord injury?

Answer 49

numbness paresthesia pain reflex loss

Question 50

What is the pneumonic to remember if a cranial nerve is sensory, motor, or both?

Answer 50

Some Say Marry Money But My Brother Says Big Brains Matter Most

Question 51

How do I test the olfactory nerve?

Answer 51

Smell coffee grounds or mint through each nostril. Normal should be smelling at odor at approx 10 cm

Question 52

Where is the motor nucleus of the trigeminal nerve?

Answer 52

Pons

Question 53

Where is the sensory nucleus of the trigeminal nerve?

Answer 53

spans midbrain to upper medulla

Question 54

What is Erin's acronym for cranial nerves?

Answer 54

OH OH OH. TO TOUCH AND FEEL. VERY GOOD VAGINAS AND HYMENS.

Question 55

What is the normal response for the blink reflex? What are we testing?

Answer 55

Stimulus: touching cornea w/ whisp of cotton Response: bilateral blinking CN V and VII

Question 56

what is the afferent nerve in the blink reflex?

Answer 56

trigenminal

Question 57

what is the efferent nerve in the blink reflex?

Answer 57

facial nerve

Question 58

what is the cochlear pathway of CNVIII?

Answer 58

cochlea, nerve, cochlear nuclei, superior olive, lateral lemniscus, inferior colliculus, medial geniculate, auditory cortex

Question 59

how do you test CN IX (accessory nerve)?

Answer 59

Motor function: innervated SCM and trap on same side, so turn your head to opposite side and shrug

Question 60

if my tongue deviates to the left when i stick it out, what side is my lesion on? what nerve is affected?

Answer 60

hypoglossal | L