Lecture 13

Question 1

What are the three layers of the eye?

Answer 1

Corneoscleral coat, uveal tract and retina

Question 2

What is the outermost layer of the eye?

Answer 2

Corneoscleral coat

Question 3

What is the middle layer of the eye?

Answer 3

Uveal tract

Question 4

What is the inner layer of the eye?

Answer 4

Retina

Question 5

What is a transparent anterior extension of the sclera?

Answer 5

Cornea

Question 6

What is the vascular coat?

Answer 6

Uveal tract

Question 7

What does the uveal consist of?

Answer 7

Iris and ciliary body anteriorly and choroid coat posteriorly

Question 8

What is the inner layer of the eye?

Answer 8

Retina

Question 9

What does the retina consist of?

Answer 9

Layers of nerve cells, their processes, support cells and a layer of pigmented epithelium

Question 10

What is the function of the biconvex lens?

Answer 10

Elastic to allow it to change its shape to permit accommodation for near vision

Question 11

What is infront of the biconvex lens?

Answer 11

Anterior and posterior chamber

Question 12

What fills the anterior and posterior chambers?

Answer 12

Aqueous humor

Question 13

What structure lies posterior to the lens?

Answer 13

Vitreal cavity

Question 14

What is the vitreal cavity filled with?

Answer 14

Vitrious humor

Question 15

Why is the vitrious humor avascular and gelatinous?

Answer 15

Due to collagen fibres and hyaluronic acid

Question 16

What is it called when the flow of aqueous humor is disrupted?

Answer 16

Glaucoma

Question 17

What part of the eye contains rods and cones?

Answer 17

Retina

Question 18

What does each rod contain?

Answer 18

Rhodopsin

Question 19

What does each cone contain?

Answer 19

3 opsin pigments

Question 20

What colours are cones sensitive to?

Answer 20

Red, green or blue light

Question 21

What are reasons for high visual acuity?

Answer 21

Thinning of retinal layers

lack of rods, high concentrations of cones

low convergence

Question 22

Are axons myelinated in the eye?

Answer 22

No

Question 23

When do axons become myelinated in the eye?

Answer 23

After passing the lamina cribrosa

Question 24

Myelin in the optic nerve is formed by?

Answer 24

Oligodendrocytes

Question 25

What surrounds the optic nerve?

Answer 25

Meninges

Question 26

Superior colliculus functions in?

Answer 26

Saccadic eye movements

Question 27

What parts of the eye receive information from the contralateral visual field?

Answer 27

Optic tract and lateral geniculate nucleus

Question 28

Where do the fibres from the lateral geniculate nucleus of the thalamus reach the primary visual cortex?

Answer 28

Geniculocalcarine tracts

Question 29

What does the primary visual cortex surround?

Answer 29

Calcarine sulcus in the occipital cortex

Question 30

What is referred to the area of Brodmann?

Answer 30

Primary visual cortex

Question 31

What is called the striate cortex?

Answer 31

Primary visual cortex

Question 32

What layers of the lateral geniculate nucleus receive visual information that has crossed from opposite eyes?

Answer 32

1, 4 and 6

Question 33

What layers of the lateral geniculate nucleus receive uncrossed fibres?

Answer 33

2,3 and 5

Question 34

What is hemianopia?

Answer 34

Blindness for half the field of vision in one or both eyes

Question 35

What does the frontal eye field control?

Answer 35

Movements of command

Question 36

Posterior eye fields are thought to be involved in?

Answer 36

Pursuit movements