Cranial nerves

Question 1

Patient has hoarseness what nerve is damaged? What exam finding would you have?

Answer 1

CN X vagus: recurrent laryngeal n.
Uvula deviation (deviates away from Lesion)

Question 2

Patient presents with difficulty swallowing and dry mouth. What nerve is damaged?

Answer 2

CN IX: glossopharyneal n.

Question 3

Where are the cell bodies of the facial nerve?

Answer 3

Geniculate ganglion in facial canal

Question 4

repeated middle ear infections destroyed the tympanic plexus in the middle ear. Which cranial nerve could be damaged and what symptom would occur?

Answer 4

CN IX, diminished production saliva by parotid gland. The nerve leaves the tympanic cavity via lesser petrodollars n. and synapse in optic ganglion.

Question 5

Nerves tested in corneal reflex?

Answer 5

CN V and VII

Question 6

CN V damage effect corneal reflex how?

Answer 6

Stimulate Lesion side= no blinking either side

Stimulate intact side= both eyes blink

Question 7

CN VII damage effect corneal reflex how?

Answer 7

No blinking will occur on damaged side regardless of side stimulated

Question 8

Vestibular schwannomas symptoms?

Answer 8

CN VIII damage: ipsilateral sensorineural deafness
CN VII damage: deviation tongue on protrusion, impaired taste ipsilaterally, corneal desiccation due to inability to close eyelid, drooling and loss nasolabial fold ipsilaterally, increased ossicular chain movement

Question 9

Patient has pain near lower lip and chin. What nerve is involved and which foramen does it exit?

Answer 9

Trigeminal neuralgia (CN V3) exits via foramen ovale

Question 10

Gag reflex is controlled by what nerves?

Answer 10

CN X vagus and CN IX glossopharyngeal

Question 11

Dorsal root ganglia and autonomic ganglia arise from what and have what inside them?

Answer 11

Arise from neural crest cells and are a part of PNS.
DRG: cell bodies of sensory neurons
Autonomic ganglia: synaptic junctions between preganglionic and postganglionic neurons

Question 12

What is the name of the parasympathetic ganglion that CN III oculomotor n. synapses in?

Answer 12

Ciliary ganglion

Question 13

What is the name of the parasympathetic ganglion that CN X vagus nerve synapses in?

Answer 13

Intramural ganglia

Question 14

What is the name of the parasympathetic ganglion that CN VII facial nerve chorda tympani synapses in?

Answer 14

Submandibular ganglion

Question 15

What is the name of the parasympathetic ganglion that CN IX glossopharyngeal nerve synapses in?

Answer 15

Otic ganglion

Question 16

What is the name of the parasympathetic ganglion that CN VII facial greater petrosal nerve synapses in?

Answer 16

Pterygopalatine ganglion

Question 17

Where are the sensory ganglion (containing cell bodies) of CN VII facial nerve?

Answer 17

Geniculate

Question 18

Where are the sensory ganglion (containing cell bodies) of CN V (trigeminal nerve?

Answer 18

Trigeminal

Question 19

Where are the sensory ganglion (containing cell bodies) of CN VIII vestibularcochlear n cochlear part?

Answer 19

Spiral

Question 20

Where are the sensory ganglion (containing cell bodies) of CN VIII vestibularcochlear nerve vestibular part?

Answer 20

Vestibular