Class 9/10 - Vision

Question 1

The lens divides the eyeball into what two cavities? What does each contain?

Answer 1

anterior cavity (containing aqueous humor) 
vitreous chamber (containing vitreous fluid)

Question 2

True or false: the vitreous chamber undergoes continual replacmeent

Answer 2

false

Question 3

Rods are for what kind of vision? How long does their pigment regeneration take?

Answer 3

black and white, dim lighting

5 minutes

Question 4

Cones are for what kind of vision? How long does their pigment regeneration take?

Answer 4

bright light and colour - 90 seconds

Question 5

How many rods synapse with one bipolar cell? How many cones synapse with 1 bipolar cell?

Answer 5

rods: 6-100
cones: 1

Question 6

The fact that 1 cone synapses with 1 bipolar cell means that bright light/colour vision is LESS _____ but also _____.

Answer 6

LESS sensitive but sharper in vision

Question 7

75% of light refraction occurs in the ____

Answer 7

cornea

Question 8

25% of light refraction occurs in the ___

Answer 8

lens

Question 9

Some axons from the optic tract don’t terminate in the lateral gerniculate nucleus of the thalamus, but instead travel to the ____ and ___ of the midbrain

Answer 9

superior colliculi & pretectal nuclei

Question 10

The macula lutea is the ___ and contains the ____.

Answer 10

exact centre of the posterior retina

fovea centralis

Question 11

What is the fovea centralis?

Answer 11

area containing only cones with area of highest visual acuity or resolution in the eye

Question 12

What is the ora serrata?

Answer 12

the zone between the retina and ciliary body

Question 13

Describe the innervations of the tongue

Answer 13

anterior 2/3 = facial nerve

posterior 1/3 = glossopharyngeal