5.5 Visual Pathways Flashcards Preview

Gross Anatomy > 5.5 Visual Pathways > Flashcards

Flashcards in 5.5 Visual Pathways Deck (24):
1

What layer of the retina are the rods located?

peripheral retina

2

What layer of the retina are the cones located in?

macula region of the retina (central)

3

What is the center of the macula called that only contains cones?

fovea

4

What spot in the retina contains no receptors and is considered the blind spot; where optic nerve enters eye?

optic disc

5

What is the yellowish oval area lateral to optic dis with a central depressed spot?

Macula lutea

6

What is the most acute area of vision?

fovea centralis

7

Which fibers cross in the optic chiasm?

nasal retinal fibers cross to contralateral side and head to contralateral optic tract

8

What structure forms posterior to the optic chiasm?

optic tract

9

What structure is superior to the optic chiasm?

pituitary gland

10

Where does the optic tract project to and where do most fibers synapse?

thalamus (lateral geniculate nucleus)

11

What are the fibers exiting the LGN known as?

Optic radiations that extend into the visual cortex

12

Where is the primary visual cortex located?

occipital lobe (Brodmann area 17)

13

Where do the superior optic radiations terminate?

cuneus gyrus

14

Where do the inferior optic radiations terminate?

lingual gyrus

15

Which structure do the fibers pass through from the primary visual cortex to in the occipital lobe?

visual association cortex (Brodmann area 19)

16

The visual association cortex receives visual feedback from the primary visual cortex and projects to the .... in the midbrain.

pretectal nucleus

17

The pretectal nucleus projects bilaterally to what?

Edinger Westphal nucleus

18

The Edinger Westphal nucleus gives rise to preganglion parasympathetic axons that travel via CN III to what to synapse?

ciliary ganglion

19

Postganglionic parasympathetic innervation from CN III to what?

sphincter pupillae to constrict pupil and ciliaris muscle to thicken lens

20

What visual defect is caused by a pituitary adenoma?

bitemporal hemianopia (loss of half the visual field on the temporal side)

21

What results from transection of left optic tract?

Right hemianopia (loss of vision from nasal field of left eye and temporal field of right eye)

22

In temporal lobe lesions, Meyer's loop may be affected, giving rise to visual deficit known as?

contralateral upper quadrantopia

23

What results from transection of cuneus gyrus?

contralateral lower quadrantopia

24

What results from transection of lingual gyrus?

contralateral upper quadrantopia