Cranial Nerves III, IV, VI

Question 1

nerves sometimes responsible for deviations of eye alignment

Answer 1

III, IV, VI

Question 2

primary function of medial longitudinal fasciculus

Answer 2

coordinate eye movements

Question 3

example of a lesion affecting the MLF

Answer 3

multiple sclerosis

Question 4

the lobe that controls rapid or darting eye movement

Answer 4

frontal lobe

Question 5

the lobe that controls smooth or following eye movement

Answer 5

occipital lobe

Question 6

the result of uncoordinated attempts at controlling eye movements

Answer 6

nystagmus

Question 7

disease of this nerve causes eyelid ptosis

Answer 7

CN III

Question 8

disease of this nerve causes difficulty when looking down and in

Answer 8

CN IV

Question 9

disease of this nerve causes inability to laterally deviate the eye on the same side

Answer 9

CN VI

Question 10

disease of this nerve will diminish pupil constriction with bilateral symmetry

Answer 10

CN II

Question 11

disease of this nerve will cause inability to constrict pupil in same eye

Answer 11

CN III

Question 12

often due to lesions of the neck proximal to the carotid artery bifurcation

Answer 12

Horner’s syndrome

Question 13

signs of Horner’s syndrome

Answer 13

ptosis, pupilloconstriction, facial anhydrosis, ipsilateral facial vasodilation

Question 14

often due to lesions that are distal to the carotid artery bifurcation and that are along the internal carotid pathway

Answer 14

pupilloconstriction and ptosis

Question 15

often due to lesions that are distal to the carotid artery bifurcation and that are along the external carotid pathway

Answer 15

vasodilation and anhydrosis

Question 16

enophthalmos

Answer 16

inward sinking of the eyeball in the eye socket

Question 17

3 components of accommodation

Answer 17

convergence, pupilloconstriction, lens thickening

Question 18

the 3 components of accommodation are dependent on this CN

Answer 18

CN III

Question 19

clinical findings that accompany nystagmus

Answer 19

nausea, vertigo, vomiting, ataxia

Question 20

with nystagmus, which is the side with the problem?

Answer 20

the side that has the quick component

Question 21

the 4 basic areas of the fundus of the eye that should be examined

Answer 21

optic disc, blood vessels, macula, general background

Question 22

in the eye if the cup is not smaller than the disc it could indicate

Answer 22

glaucoma

Question 23

with this disease the disc appears blurred with jagged edges

Answer 23

papilledema

Question 24

this problem causes the optic disc to have a dead white color and also have a visual loss

Answer 24

primary optic atrophy

Question 25

this problem causes the optic disc to be gray and ragged and could be secondary to another pathology

Answer 25

secondary optic atrophy

Question 26

inflammation of the optic nerve

Answer 26

optic neuritis

Question 27

inflammation of the optic disc

Answer 27

papillitis

Question 28

optic neuritis or papillitis could indicate early signs of

Answer 28

MS

Question 29

collections of degenerative deposits that often appear in the fundus of elderly people

Answer 29

Drusen bodies

Question 30

when looking up and to the right, the nerve and muscle used in each eye:

Answer 30

right eye: superior rectus & CN III | left eye: inferior oblique & CN III

Question 31

when looking laterally to the right, the nerve and muscle used in each eye:

Answer 31

right eye: lateral rectus & CN VI | left eye: medial rectus & CN III

Question 32

when looking down and to the right, the nerve and muscle used in each eye:

Answer 32

right eye: inferior rectus & CN III | left eye: superior oblique & CN IV

Question 33

when looking up and to the left, the nerve and muscle used in each eye:

Answer 33

left eye: superior rectus & CN III | right eye: inferior oblique & CN III

Question 34

when looking laterally to the left, the nerve and muscle used in each eye:

Answer 34

left eye: lateral rectus & CN VI | right eye: medial rectus & CN III

Question 35

when looking down and to the left, the nerve and muscle used in each eye:

Answer 35

left eye: inferior rectus & CN III | right eye: superior oblique & CN IV

Question 36

how would a CN III dysfunction present on observation?

Answer 36

ptosis, eye points down and lateral

Question 37

how would a CN IV dysfunction present on observation?

Answer 37

when patient reads may have double vision, have issues when looking down and in (would notice issues when doing fields of gaze test)

Question 38

how would a CN VI dysfunction present on observation?

Answer 38

patient can't look lateral, eyeball may be positioned more medially

Question 39

which nerves are involved in the cavernous sinus?

Answer 39

3, 4, 5, 6

Question 40

MS will affect medial longitudinal fasciculus in this way

Answer 40

inability to gaze lateral

Question 41

a fast nystagmus would indicate problems in this area

Answer 41

frontal

Question 42

a slow nystagmus would indicate problems in this area

Answer 42

occipital

Question 43

heterotopia

Answer 43

deviation of bilateral eye alignment

Question 44

exotropia

Answer 44

outward/lateral eye movement

Question 45

esotropia

Answer 45

inward/medial eye movement

Question 46

hypertropia

Answer 46

upward direction eye movement

Question 47

hypotropia

Answer 47

downward direction eye movement

Question 48

nerve that exits the midbrain just medial to the cerebral peduncle

Answer 48

CN III

Question 49

compression to this nerve gives nerve palsy plus contralateral hemiparesis

Answer 49

CN III

Question 50

nerve that supplies superior oblique muscles

Answer 50

CN IV

Question 51

nerve that turns the eyeball down & in

Answer 51

CN IV

Question 52

nerve that supplies lateral rectus

Answer 52

CN VI

Question 53

nerve that functions in eye abduction

Answer 53

CN VI

Question 54

CN III, IV, VI travel here

Answer 54

superior orbital fissure