Visual Pathways Flashcards Preview

Neuroanatomy > Visual Pathways > Flashcards

Flashcards in Visual Pathways Deck (30):
1

apperceptive agnosia

perceptual deficit (distinction between shapes is difficult)

2

associative agnosia

can describe but can't assign any meaning to objects (able to recognize simple shapes and copy complex shapes but are unable to recognize what an object is)

3

object agnosia

lesions on left side (can still recognize an object using non-visual cues)

4

prosopagnosia

inability to recognize faces

5

alexia without agraphia

can write but can't read

6

acrhomatopsia

inability to recognize color (damage to fusiform gyrus)

7

balint syndrone

loss of voluntary eye movement (parieto-occipital junction)

8

asimultagnosia

inability to understand visual objects

9

scotoma

a circumscribed region of visual loss

10

homonymous defect

a visual field defect in the SAME region of both eyes

11

refractive error

indistinct vision improved by corrective lenses

12

photopsias

bright, unformed flashes, streaks, or balls of light

13

phosphenes

photopsias produced by retinal shear or optic nerve disease

14

entopic phenomena

seeing structures in one's own eye

15

illusions

distortion or misinterpretation of visual perception

16

hallucination

perception of something that is NOT present

17

function of the retinohypothalamic tract; what is the nucleus projecting to this tract

biological clock (provides information regarding external cyclical changes in the day to our internal clock), functions in circadian rhythms. nucleus is suprachiasmatic nuc.

18

where are the retinal projections for the pupillary light reflex ?

pretectal region

19

projections from the retina to the superior colliculus function in

visual (visual tracking), somatic, and auditory information and directs the head and eyes towards the stimuli

20

the superior colliculus and the frontal eye fields controls what ?

saccadic eye movements

21

where does the superior colliculus project to

eye movement regions in the MIDBRAIN; tectospinal tract (head and neck) and the tectopontine (cerebellum)

22

damage to optic chiasma often results in

bitemporal hemianopia

23

retrochiasmal lesions often cause

homonymous vision field defects

24

lesion of the optic tracts often result in

contralateral homonymous hemianopia

25

temporal lobe lesions cause

pie in the sky vision

26

parietal lobe lesions cause

pie in the floor vision

27

lesions of the entire optic radiation results in

contralateral homonymous hemianopia

28

lesions in the upper bank of the calcarine fissure cause

contralateral inferior quadrantnaopia

29

lesions in the lower bank of the calcarine fissure causes

contralateral superior quadrantanopia

30

damage to the entire visual cortex results in

contralateral homonymous hemianopia