Vision

Question 1

Order of neuron in vision

Answer 1

1st photoreceptor (rods and cone)
2nd bipolar cell ( chemical impulse)
3rd ganglionic cell ( generate ap)
Optic nerve ( axons of ganglionic cell)

Question 2

Pathways of vision

Answer 2

Retina>Optic nerve > optic chiasma(nasal fibre) > optic tract > lateral genticulate body> pathways( magno and parvo cellular ) > visual cortex ( 17,18,19).

Question 3

Extrastraite cortex

Answer 3

Color> temporal> ventral > occipital ( mayers’s loop)
Eye movement> parietal>dorsal> occipital ( baum’s loop)

Question 4

Anopia and anomaly

Answer 4

Red, prot
Blue trit
Green deuter

Question 5

phototraduction

Answer 5

rhodopsin { retina + opsin }
isomerase ( light)
all trans retinal
gpcr
transducin
pde
decreases cGMP
na+2 channel clousure
hyprpolarisation

Question 6

leateral geniculate body layers

Answer 6

1,2 magnocellular pathway ( eye ball movement, streopsis)
3,4,5,6 parvo cellular ( colour vision, acuity)

Question 7

pathways side

Answer 7

2,3,5 ipsilaterally
1,4,5,6 contralaterally

Question 8

cycle of phototransduction

Answer 8

wald’s visual cycle