Cranial Nerves

Question 1

Which two cranial nerves are not true cranial nerves

Answer 1

Olfactory and optic

Question 2

Where do the cranial nerves that have motor function take origin

Answer 2

Collection of cells deep within the brain stem (analogous to anterior horn cells)

Question 3

Which cranial nerve has contralateral innervation in the lower part of the nuclei

Answer 3

Cranial nerve 7

Question 4

Unilateral CN 5,7 and 8

Answer 4

Cerebellopontine angle lesion

Question 5

Unilateral CN 3, 4, 5 and 6

Answer 5

Cavernous sinus lesion

Question 6

Combined unilateral CN 9, 10 and 11

Answer 6

Jugular foramen syndrome

Question 7

Combined bilateral CN 10, 11 and 12

Answer 7

If lower motor neuron: bulbar palsy

If upper motor neuron: pseudobulbar

Question 8

It’s common cause of intrinsic brain stem lesion in a younger patient

Answer 8

Multiple sclerosis

Question 9

Most common cause of intrinsic brain stem in an older patient

Answer 9

Vascular disease

Question 10

Where do the sensory nuclei develop

Answer 10

Within. The dorsal or alar plate of the neuro tube

Question 11

Where do the motor nuclei develop

Answer 11

Within basal plate

Question 12

Olfactory nerve exams

Answer 12

1. Observation of external nose
2. Observation of internal nasal passage
3. Check sense of smell by testing each side let seperatly and with seperate scents

Question 13

Optic nerve exams

Answer 13

1. Observation of eyes( limbus to lid limbus to canthi)
2. Test visual acuity(snellen chart)
3. Test gross visual field(peripheral vision)
4. Pupillary light reflex
5. Ophthalmoscopic exam

Question 14

Oculomotor, trochlear, and abducens exams

Answer 14

1. Observation of eyes
2. Cornmeal light reflex
3. Pupillary light reflex
4. 6 Cardinal fields of gaze

Question 15

Trigeminal nerve exams

Answer 15

1. Cornmeal blink reflex
2. Light touch sensation on the face
3. Sharp sensation on the face
4. Inspect muscles of mastication for tone and strength
5. Jaw jerk reflex
6. General sensation of the anterior 2/3 of the tongue

Question 16

Facial nerve exams

Answer 16

1. Check musculature of the face(smile,look up)

2. Check taste (anterior 2/3 of tongue)

Question 17

Vestibulocochlear nerve exams

Answer 17

1. Observation of external ears
2. Observation of internal ears
3. Rinse test
4. Weber test
5. Finger rustle test
6. Schwabach test
7. Watch tick test

Question 18

Glossopharyngeal and vagus nerve exams

Answer 18

1. Have patient say “ahhhh”
2. Gag reflex (posterior 1/3 of the tongue)
3. Check phonation (K-L-M test)

Question 19

Accessory nerve exams

Answer 19

1. Shoulder elevation

2. Muscle strength (SCM and trapezius)

Question 20

Hypoglossal nerve exams

Answer 20

1. Stick out tongue

2. Tongue in cheek test

Question 21

What is anosmia

Answer 21

Complete loss of smell

Question 22

What is anosmia indicative of

Answer 22

Cortical lesion