Vision. Fields of Vision and the Visual Pathway.

Question 1

What is the visual field?

Answer 1

The part of the external world that is seen by the eye.

Question 2

What part of the brain is the visual field transmitted to so it can be processed?

Answer 2

The visual cortex.

Question 3

Do both eyes form the visual field?

Answer 3

No, each eye has its own individual visual field.

Question 4

What kind of visual field do predatory animals have?

Answer 4

A large binocular field of vision.

Question 5

What kind of visual field do prey animals have?

Answer 5

A monocular field of vision as their eyes are on the lateral sides of their head.

Question 6

How to animals with monocular vision use their eyes to view the world?

Answer 6

They use each individual eye to survey the world and stay alert for predators.

Question 7

What part of the eye picks up the light from anything within the field of vision?

Answer 7

The temporal retina.

Question 8

Where do all of the nerve fibres from the retina travel to?

Answer 8

They all converge together to form the optic nerve.

Question 9

What is the name of the location where the optic nerve originates from?

Answer 9

The optic disc.

Question 10

Where does the optic nerve travel to and from?

Answer 10

From the optic disc.

To the base of the brain where it joins the brain at the optic chiasm.

Question 11

What happens to nerve fibres of the optic nerve once it reaches the optic chiasm of the brain?

Answer 11

Some of the nerve fibres will cross over and some will not.

Question 12

What fibres will cross over in the optic chiasm?

Answer 12

Anything from the peripheral field of vision will cross over.

Question 13

Are the fibres from the peripheral field of vision contralateral or ipsilateral?

Answer 13

Contralateral.

Question 14

Are the fibres from the central field of vision contralateral or ipsilateral?

Answer 14

Ipsilateral.

Question 15

What happens to the nerve fibres after they have passed through the optic chiasm?

Answer 15

They run up the optic tract.

Question 16

Where in the brain is the optic tract located?

Answer 16

Between the optic chiasm and the thalamus.

Question 17

The left optic tract will carry central vision from what eye?

Answer 17

The left eye.

Question 18

The left optic tract will carry peripheral vision from what eye?

Answer 18

The right eye.

Question 19

The right optic tract will carry central vision from what eye?

Answer 19

The right eye.

Question 20

The right optic tract will carry peripheral vision from what eye?

Answer 20

The left eye.

Question 21

Is the optic tract a 1st, 2nd or 3rd order neuron?

Answer 21

A 2nd order neuron.

Question 22

2nd order neurons for vision will travel from where to where?

Answer 22

The optic chiasm to the thalamus.

Question 23

What happens once the stimuli for vision reach the thalamus?

Answer 23

They synapse form 2nd to 3rd order neurons.

Question 24

Where do the 3rd order neurons for vision travel to and from?

Answer 24

From the thalamus.

To the visual cortex.

Question 25

What order neurons travel through the optic striations?

Answer 25

3rd order neurons.

Question 26

Where in the brain is light interpreted into vision?

Answer 26

In the visual cortex.

Question 27

What animals have a large amount of visual nerves that cross over?

Answer 27

Prey animals.

Question 28

What animals have 100% peripheral vision?

Answer 28

Snakes.

All fibres cross over.

Question 29

What specialised organs give snakes 3D vision?

Answer 29

The pit organ.

Question 30

How many nerves will cross over in the eyes of humans?

Answer 30

50%.

Question 31

How many nerves will cross over in the eyes of predators?

Answer 31

60-70%.