Cranial nerve motherload

Question 1

CN1 is associated what bulb

Answer 1

Olfactory bulb

Question 2

CN2 is associated with what nuclei

Answer 2

lateral geniculate N & Superior colliculus Hypothalamus

Question 3

Where does the CN2 fibers originate?

Answer 3

retinal ganglion neurons

Question 4

What type of sensory fibers are in CN1 and CN2?

Answer 4

Special sensory only

Question 5

CN3 is associated with what nuclei

Answer 5

Occulomotor N & Edinger-Westphal N

Question 6

Fibers from the Occulomotor N innervate?

Answer 6

Superior, inferior, medial rectus M
Inferior oblique
Levator palpebrae superiorioris m

Question 7

CN4 is associated with what nuclei

Answer 7

Trochlear N

Question 8

Which CN3 nuclei is visceral motor? and what does it innervate

Answer 8

Edinger-Westphal N –> Sphincter papillae m. and ciliary m

Question 9

CN5 is assoc with what nuclei

Answer 9

Chief sensory N
Mesencephalic N
Spinal N
Trigeminal motor N

Question 10

Chief sensory N of V innervates

Answer 10

skin and deep m of head; dura

Question 11

Mesencephalic N of V innervates

Answer 11

muscle spindles

Question 12

Spinal N of V innervates

Answer 12

skin and deep m of head; dura

Question 13

Trigeminal motor N of V innervates

Answer 13

m of mastication

Question 14

What type of fibers are CN4 and CN6?

Answer 14

Somatic Motor only

Question 15

CN7 is associated with what nuclei?

Answer 15

Solitary N (rostral half)
Spinal N of V
Superior salivatory N
Facial motor N

Question 16

Solitary N (rostral half) from CN7 innervates

Answer 16

tongue= taste buds of rostral tongue, soft palate

Question 17

Spinal N of V from CN7 innervates

Answer 17

ear (ext acoustic meatus, outer TM)

Question 18

Superior salivatory N from CN7 innervates

Answer 18

GLANDS! submadibular, sublingual , lacrimal

• goes through greater petrosal –> * Pterygopalating g –> Lacrimal
• goes through chord tympani –> *submandibular g –> submandibular gland

Question 19

Facial motor N from CN7 innervates

Answer 19

m of facial expression
stylohyoid m
posterior digastric m
stapedius m

Question 20

What foramen does CN7 exit?

Answer 20

Internal acoustic meatus

Question 21

What ganglion does all the nuclei assoc with CN7 go through?

Answer 21

Geniculate ganglion

Question 22

What nuclei is assoc with CN 8

Answer 22

vestibular N

Dorsal/Ventral cochlear N

Question 23

What does the nuclei of CN8 innervate?

Answer 23

Organ of Corti, semicircular canals, maculae of utricle and saccule

Question 24

What nuclei are assoc with CN9

Answer 24

Solitary N rostral
Solitary N caudal
Spinal N of V
Inferior salivatory N 
ambiguus N

Question 25

Solitary N rostral from CN9 innervates

Answer 25

tongue posterior 1/3

Question 26

Solitary N caudal from CN9innervates

Answer 26

carotid body, carotid sinus

Question 27

Spinal N of V from CN9 innervates

Answer 27

Nasopharynx, oralpharynx, tympanic cavity, inner leaflet of the TM

Question 28

Inferior salivatory N from CN9

Answer 28

parotid gland

Question 29

ambiguus N from CN9

Answer 29

stylopharyngeus m.

Question 30

CN X is associated with what nuclei

Answer 30

``` Solitary N rostral Solitary N caudal Spinal N of V Dorsal motor N of X ambiguus N ``` **Similar to 9 except for dorsal motor

Question 31

Solitary N rostral from CN10 innervates

Answer 31

taste buds of epiglottis

Question 32

Solitary N caudal from CN10 innervates

Answer 32

thoacic and abdominal viscera, larynx mucous membranes

Question 33

Spinal N of V from CN10 innervates

Answer 33

auricle

Question 34

Dorsal motor N of X from CN10 innervates

Answer 34

thoracic and abdominal viscera

Question 35

ambiguus N from CN10 innervates

Answer 35

larynx and pharynx

Question 36

CN 11 accessory N innervates

Answer 36

SCM/ Trapezius m

Question 37

CN12 Hypoglossal N innervates

Answer 37

M of the tongue

Question 38

CN11 and 12 contain what type of fiber

Answer 38

Somatic motor ONLY so... 4+6+11+12 contain somatic motor ONLY

Question 39

which CN palsies is almost ALWAYS PNS damage?

Answer 39

3,4,6 (except gaze palsies) 5 10 11

Question 40

the facial motor nucleus innervates musculature on the ipsilateral or contralateral side of face?

Answer 40

Facial motor nucleus = IPSILATERAL | *doesNOT cross

Question 41

a LOWER motor neuron lesion from damage to the facial motor nucleus, what would result?

Answer 41

weakness of whole ipsilateral face (can't blink or close eyes on the bad side)

Question 42

a UPPER motor neuron lesion from damage to the facial motor nucleus, what would result?

Answer 42

weakness of the contralateral lower segment of face

Question 43

which part of the face gets bilateral innervation from the corticobulbar tract?

Answer 43

upper part of face, forehead

Question 44

if you had damage to the corticobulbar tract on the L side

Answer 44

paralysis of the right LMN of face, but right forehead would still be in tact as it still gets input from the contralateral side

Question 45

what type of lesion is bells palsy?

Answer 45

a lower motor neuron lesion = COMPLETE paralysis of the L face

Question 46

if smile is asymmetric but eyebrows are symmetric.... this means?

Answer 46

CNS damage

Question 47

if smile and eyebrows are asymmetric?

Answer 47

PNS damage

Question 48

If smile and eyebrows are symmetric

Answer 48

CN3 is perfecto!