Eye

Question 1

Re. the retina, what/where are the photoreceptors?

Answer 1

Rods and cones are at the back of the retina - responsive to light

Question 2

Cones

Answer 2

a. daytime vision
b. greatest acuity,
c. concentrated in fovea – central area of retina that contains only cones and has greatest visual acuity

Question 3

Fovea

Answer 3

central area of retina that contains only cones and has greatest visual acuity

Question 4

Rods

Answer 4

a. light sensitive,

b. mediate vision in dim illumination

Question 5

How to activate rods and cones?

Answer 5

When light falls on them

Question 6

What cells are activated by lights?

Answer 6

Bipolar cells

Question 7

Where are the ganglion cells?

Answer 7

In the optic nerve

Question 8

Tell me about the optic disk

Answer 8

It is where the ganglion cell axon exit eye in optic nerve. Contains no photoreceptors and creates a blind spot

Question 9

Overview of visual system

Answer 9

1. eye
2. optic nerve
3. optic track
4. optic chiasm
5. lateral geniculate
6. optic radiations
7. primary visual cortex – calcarine fissure – striate cortex
8. association visual cortex
9. or from optic chiasm to
   - superior colliculus -> thalamus -> secondary visual cortex
   
   • for control of head orientation and eye movements to stimuli in periphery

hypothalamus
-for control of circadian rhythms for sleep-wake cycles

Question 10

or from optic chiasm to…

Answer 10

Superior colliculus-> thalamus-> secondary visual cortex…for control of head orientation and eye movements to stimuli in periphery

to hypothalamus for control of circadian rhythms for sleep-wake cycles