Friday, 4-22-Visual System (Stephens)

Question 1

The visual field projects an __ image onto the retinal field

Answer 1

Inverted and reversed

Question 2

The upper nasal visual quadrant projects to the __ retinal quadrant

Answer 2

Lower temporal

Question 3

The lower nasal visual quadrant projects to the __ retinal quadrant

Answer 3

Upper temporal

Question 4

The upper temporal visual quadrant projects to the __ retinal quadrant

Answer 4

Lower nasal

Question 5

The lower temporal visual quadrant projects to the __ retinal quadrant

Answer 5

Upper nasal

Question 6

The ___ pathway constitues the primary pathway for visual information

Answer 6

Retinogeniculostriate

Question 7

Which fibers from the hemiretina cross in the optic chiasma?

Answer 7

Fibers from the nasal hemiretina

Question 8

Information from the lower hemiretina projects to ___

Answer 8

Lateral part of the Lateral geniculate body, the Loop of meyer, and the Lingual gyrus

Question 9

__ refer to corresponding halves of visual fields such as the temporal field of 1 eye and the nasal field of the other.

Answer 9

Homonymous visual fields

Question 10

___ refer to noncorresponding visual fields (i.e., temporal field of 1 eye and temporal field of the other)

Answer 10

Heteronymous visual fields

Question 11

The right nasal field of the left eye and the right temporal field of the right eye are an example of a __ visual field

Answer 11

Homonymous

Question 12

The right nasal field of the left eye and the left nasal field of the right eye is an example of a __ visual field

Answer 12

Heteronymous

Question 13

Monocular blindness is due to a lesion of the ___

Answer 13

Optic nerve

Question 14

Binasal hemianopia is due to a bilateral lesion of the ___ that results in a heteronymous blindness in the nasal fields of each eye.

Answer 14

Lateral aspect of the optic chiasma

It may also be unilateral since it is frequently due to atherosclerosis of the ICAs

Question 15

A unilateral lesion of the lateral aspect of the optic chiasma results in a __ of the ipsilateral eye

Answer 15

Nasal hemianopia

Question 16

A lesion of the temporal retina of the left eye would result in a __

Answer 16

Right nasal hemianopia of the left eye

Question 17

Bitemporal hemianopia may be due to a ___

Answer 17

Midline lesion of the medial portion of the optic chiasma

Question 18

Bitemporal hemianopsia is usually caused by a ___

Answer 18

Pituitary tumor

Question 19

Unilateral lesions of the lateral geniculate body, complete optic radiations, or visual cortex result in a ___

Answer 19

Contralateral homonymous hemianopsia

Question 20

Unilateral lesions of the __ usually result in contralateral superior quadrantanopia

Answer 20

Loop of meyer

Question 21

A left superior quadrantanopia would indicate a lesion of the ___

Answer 21

Right loop of meyer

Question 22

An incongruent contralateral homonymous hemianopia with macular sparing is usually indicative of a unilateral lesion of the ___

Answer 22

Visual cortex and may be due to obstruction of posterior cerebral artery

Question 23

A left homonymous hemianopia with macular sparing would indicate a lesion of the __

Answer 23

Right primary visual cortex

Question 24

The pupillary constriction associated with a normal response to shining an exam light into a patients eye is a parasympathetic mediated response that is centrally processed through the ___

Answer 24

Pretectum

Question 25

__ is the critical link for the consensual light reflex

Answer 25

Posterior commissure

Question 26

Accomodation is a __ -mediated visual response which originates in the frontal eye field of the frontal lobe.

Answer 26

Cortically

Question 27

__ fibers synapse on the edinger-westphal and oculomotor nuclei to produce the triad of accomodation

Answer 27

Corticotectal fibers

Question 28

Holmes-adie pupil or tonic pupil is a benign condition, which may be due to a lesion of the ___

Answer 28

Ciliary ganglion

Question 29

Voluntary movements of the eyes are controlled by the __

Answer 29

Frontal eye fields

Question 30

Nonvolitional eye movements are controlled by the __

Answer 30

Occipital eye fields

Question 31

Clinically, lesions of the visual system are always described in terms of their __ deficits

Answer 31

Visual field