Midterm - Cranial Nerve

Question 1

Amosmia

Answer 1

Complete loss of sense of smell

Question 2

Hyposmia

Answer 2

Diminished sense of smell

Question 3

Loss of sense of smell is commonly (bilateral/unilateral)

Answer 3

Bilateral

Question 4

What does anosmia that is new on onset and unilateral suggest?

Answer 4

Intracranial mass

Question 5

Dysosmia/ Parosmia

Answer 5

Difficulty identifying odors (considered idiopathic)

Question 6

Phantosmia

Answer 6

Hallucination of an odor when none present (implies a problem in the olfactory cortex)

Question 7

What does CN II do?

Answer 7

Sensory only: vision and afferent portion of pupil constriction

Question 8

What is the degree of Nasal and temporal Peripheral vision of the horizontal field

Answer 8

Nasal : 60 Temporal: 90-110

Question 9

What is the degree of superior and inferior peripheral vision of the vertical field

Answer 9

Superior: 50 Inferior: 70

Question 10

Globally narrowed visual fields can be cause by

Answer 10

Primary open angle glaucoma (high pressure in the eye damages the optic nerve)

Question 11

If the widest diameter of visual field in the better eye is less than or equal to 20 degrees

Answer 11

Legally blind

Question 12

Hemianopsia

Answer 12

Loss of 1/2 of the visual field

Question 13

Chiasmal tumor (pituitary tumor) pressing on the optic chiasm causes

Answer 13

Bitemporal hemianopsia

Question 14

Homonymous hemianopsia

Answer 14

Loss of 1/2 of the same side of the visual field in each eye

Question 15

What can cause homonymous hemianopsia?

Answer 15

Complete loss of nerve function at the - right optic tract or a - complete right optic radiation defect (often due to stroke)

Question 16

Quadrantinopsia

Answer 16

Blindness in 1/4 of the visual field

Question 17

What causes quadrantinopsia?

Answer 17

Partial lesion of the optic radiation on one side - usually due to a stroke in the parietal lobe

Question 18

The loss of the superior 1/4 of the left visual fields (due to injury to the inferior part of the right optic radiation)

Answer 18

Homonymous left superior quadrantinopsia

Question 19

Normal pupillary light reflex direct response

Answer 19

Pupil with the light source constricts

Question 20

Normal pupillary light reflex consensual response

Answer 20

Constriction of the pupil in the eye opposite from the light source