CN V, VII, IX, XI, XII

Question 1

Trigeminal nerve contains what kind of fibers

Answer 1

sensory and motor

Question 2

WHere is the nucleus of CN V located

Answer 2

Trigeminal nucleus called motor nucleus of V and is located mid pons

Question 3

Travel of CN V

Answer 3

Motor fibers of CN V travel with the mandibular branch of CN V.
CN V exits the skull through the foramen ovale

Question 4

CN V innervates what

Answer 4

Muscles of mastication and the temporalis muscles

Question 5

Jaw Reflex is what

Answer 5

tappng gently on the lower jaw causes spindles in the masseter muscle to send an impulse through the sensory fibers of sensory cranial nerve V and synapse in the mesencephalic nucleus of V. A short interneuron connects the MESENCEPHALIC nucleus with the motor nucleus to send an impulse to the masseter muscle to contract.

Question 6

Test CN V how

Answer 6

Have pateint bite down on tongue depressor and test jaw strength. Palpate the masseter and temporalis muscles.

Question 7

Upper motor neuron to the CN V is ——, thus unilateral lesions to motor cortex —— produce unilateral weakness of the jaw

Answer 7

Bilateral, Do not produce unilateral weakness of the jaw, although jaw reflex may be encreased

Question 8

Lesions of CN V will cause

Answer 8

unilateral weakness of the jaw

Question 9

CN VII carries what type of nerve fibers

Answer 9

motor, sensory, parasympathetic

Question 10

Nucleus is where

Answer 10

rostral medulla

Question 11

What the fuck is the superior salivary nucleus

Answer 11

It is the parasympathetic aspect of CN VII. lies right below CN VII nucleus pretty much. travels via nervus intermedius

Question 12

CN VII and nervus intermedius exit the brainstem where?

Answer 12

pontomedullary junction called cerebellopontine angle

Question 13

What is facial colliculi

Answer 13

A bulge on the flor of the fourth ventricle caused by the facail nerve fibers coming over the abducens nerve fibers bfore turning lateral and anterior to exit the brainstem.

Question 14

Where does the CNVII exit the skull

Answer 14

Courses through teh internal audiotry meatus before turnign ventrally and exiting out the stylomastoid formen

Question 15

Testing for CN VII

Answer 15

• wrinkle your fucking forehead
• show your teeth
• close eyes tightly

Question 16

Upper motor neuron input to cranial nerve VII is bilateral for the forehead muscles but unilateral for the facial muscles. Thus a unilateral lesion to the motor cortex would present how

Answer 16

No symptoms in the forehead but ipsilateral weakness in the face

Question 17

Unilateral lower motor neuron lesions of CN VII cause what

Answer 17

Ispilateral face and forehead weakness.

May also have dry eye and hyperacusis

Question 18

Common cause of one sided facial paralysis due to trigeminal infection

Answer 18

Bells palsy

Question 19

Motor nerve VII also controlscorneal reflex…how do you test this

Answer 19

gently stroke cornea and observe eye closure

Question 20

CN IX nucleus

Answer 20

Glossopharyngeal nerves nucleus is the nucleus ambiguus located near the junction of the pons and medulla (pontomedullary junction

Question 21

CN IX innervates what

Answer 21

Innervates the stylopharyngeus muscle which raises the pharynx and larynx

Question 22

Inferior salivatory nucleus sends preganglionc parasympathetic fibers out via CN IX to the what nerve

Answer 22

Lesser petrosal,,, then synapses in otic ganglion and goes to parotid gland

Question 23

CN IX exits skull through what foramen

Answer 23

Jugular foramen

Question 24

Describe the nucleus of the vagus nerve

Answer 24

Two nuclei:
1) Nucleus ambiguus- innervates soft palate, pharynx, larynx

2) Dorsal nucleus: Sends preganglonic parasympathetic fibers to the intramural ganglia assoc with heart, lung, and giestive tract

Question 25

X eexits the calvarium via

Answer 25

The jugular foramen

Question 26

Motor fibers of X which innervate the pharynx do what

Answer 26

Raise it during talking and swallowing

Question 27

What nerves participate in gag reflex

Answer 27

9 and 10

Question 28

Unilateral lesions in the nucleus ambiguus or CN X will cause

Answer 28

dysphagia due to an inability to elevate the palate on teh ipsilateral side

Question 29

Substantial bilateral upper motor neuron innervation means…

Answer 29

unilateral upper motor neuron lesions tend to produce less prominent symptoms

Question 30

CN V (motor) innervates what

Answer 30

masseter and temporalis (mastication)
tensor tympani (dampens sound)
Tensor Veli palatini (opens eustachian tube)
Mylohyoid
Inferior belly of digastric

Question 31

CN VII innervates

Answer 31

muscles of facial expression and stapedius (dampens sound)

Question 32

CN XI ( Spinal Accessory nerve) does what

Answer 32

Pure motor nerve that controls head turning via innervation of the Sternocleidomastoid muscles and shoulder elevation through the trpezius

Question 33

Spinal nerve XI receives motor neuron input from what nuclei

Answer 33

Nucleus ambiguous and spinal accessory nucleus

Question 34

Spinal accessory nucleus located where

Answer 34

intermediolateral gray area of between dorsal and ventral horns of the first 4-5 segments of spinal cord. Enter the calvarium through foramen magnum

Question 35

Lesion of the lower motor neuron of CN XI (the nerve itself or its nuclei) will cause what?

Answer 35

ipsilateral trapezius weakness and ipsilateral SCM weakness. This will present in clinic as weakness of the ipsilateral trapezius and trouble turning the head to the opposite side of the SCM weakness

Question 36

UMN leasion of CN XI will cause

Answer 36

contralateral trapezius weakness and ipsilateral weakness of the SCM (on the side of the UMN lesion)

Question 37

Why does the SCM receive ipsilateral innervation from UMN

Answer 37

To insure that your head turns to the side that you are catching the ball. If you are catching a ball with your left hand, you need the SCM on your right side to work.

Question 38

CN XII leaves the skull via what foramen

Answer 38

hypoglossal

Question 39

CN XII controls

Answer 39

tongue movement

Question 40

Unilateral lesions of CN XII or its nuclei produce what

Answer 40

tongue sticks out towards the side of the lesion (b/c contraction of the left side pushes it toward the right and vice cersa)

Question 41

Unilateral lesions of CN XII UMN cause

Answer 41

tongue to deviate away from lesion