7 Visual Pathways and Eye Movements - B Flashcards Preview

Neuro Exam 2 > 7 Visual Pathways and Eye Movements - B > Flashcards

Flashcards in 7 Visual Pathways and Eye Movements - B Deck (67)
Loading flashcards...
1

The optic n and retina are an outgrowth of what part of the brain

Prosencephalon

2

Light passes from objects in visual field, through pupil to subtend an image upon the retina, which creates

Retinal field

3

Focusing on an object causes it to be centered where

Fovea centralis and macula lutea

4

*Visual fields are divided into what zones

Binocular (overlapping zones of eyes) Monocular (seen by one eye)

5

The monocular zones make up

Peripheral vision

6

Retinal fields are

Location on the retina that an object in the visual field is projected

7

*What are retinal hemispheres

Nasal and temporal halves of the retinal fields

8

*The image formed on the retina is inverted in what directions

Lateral and vertical dimensions

9

*The left half of the visual field is made of

Nasal half of the left retina and temporal half of the right retina

10

*The right half of the visual field is made of

Nasal half of the right retina and the temporal half of the retina

11

*Where does CN 2 decussate

Optic chiasm

12

*The nasal half of the each retina goes where

Contralateral optic tract

13

*The temporal half of each retina goes where

Ipsilateral optic tract

14

*The optic tract of each side consists of

Temporal retina fibers of ipsilateral fibers Nasal retina fibers of contralateral fibers

15

*The optic tract curves posteriorly around the cerebral peduncle and terminates in the

Lateral geniculate nucleus

16

*The ventral base of the LGN is formed by

Optic tract (retinogeniculate) fibers

17

The dorsal and lateral borders of the LGN and optic tract are formed by

Optic radiations

18

*The LGN is divided into what cellular layers

Magnocellular and parvocellular

19

*The magnocellular layer is made of

Layers 1 and 2 (ventral)

20

The magnocellular layer receives input from

Rods

21

The magnocellular layer has a _______ receptive field and is sensitive to ___________

Large; moving stimuli There are also faster conducting neurons here

22

*The parvocellular layer is made of what layers

3-6

23

The parvocellular layers receive input from

Cones

24

The parvocellular layer has a _________ receptive field and is sensitive to _________________

Small; high acuity color Slower axons than magnocellular and tonically active with stationary objects

25

*The temporal retina remain uncrossed and terminate in layers ________ of the ipsilateral LGN

2, 3, 5

26

*Nasal retina cross to contralateral side and terminate in layers _________

1, 4, 6 of contralateral LGN

27

*The R nasal retina synapses where

Left LGN layers 1, 4, 6

28

*The L temporal retina synapses where

Left LGN layers 2, 3, 5

29

*The L nasal field synapses where

Right LGN layers 1, 4, 6

30

*The R temporal retina synapses where

Layers 2, 3, 5 of the right LGN