physiology of vision Flashcards Preview

Neurology year 3 > physiology of vision > Flashcards

Flashcards in physiology of vision Deck (14):
1

what is the direct/vertical pathway for signal transmission?

photoreceptors- biploar cells-ganglion cells

2

what do horizontal cells do?

get input from photoreceptors and project with other photoreceptors and bipolar cells

3

what do amacrine cells do?

get input from bipolar cells and project to ganglion and bipolar cells and other amacrine cells

4

what are the 2 types of photorecptors?

rods and cones

5

when is there more glutamate? in the dark or in the light?

in the dark...

6

hyperpolarization occurs in response to>>>?

light

7

rods help seeing in..?

dim light

8

cones help seeing in..?

normal day light

9

more convergence on rods or cones?

rods

10

what deals with colour, rods or cones?

cones

11

what are the differences between rods and cones?

rods- ahcromatic, peripheral retina, high convergence, high light sensitivity, low visual acuity

cones- chromatic, central retina, low convergence, low light sensitivity, high visual acuity

12

where are the first binolcular neurones?

striate cortex

13

what does lateral inhibiton do?

exaggerates the difference in stimulus intensity detetced by adjacent neurones and aids localisation

also modifies the receptive fields of ganglion cells to have centre surround organization. ( ephasizes areas of contrast)

14

what cells deal with lateral inhibition?

horizontal cells and amacrine cells