Special Senses - The Eye

Question 1

What component of the eye is found within the inner most part?

Answer 1

the retina

Question 2

What cells are adapted to respond to light stimulus?

Answer 2

photoreceptor cells

Question 3

What sort of vision is seen in cats and dogs?

Answer 3

binocular (3d vision)

Question 4

What sort of vision is seen in prey species?

Answer 4

monocular (2d vision)

Question 5

The eye consists of 3 main parts, what are they?

Answer 5

1. the eyeball
2. the extrinsic muscles
3. the eyelids

Question 6

What 2 things protect the eye?

Answer 6

bony orbit, eyelids and conjunctiva

Question 7

What three glands secrete/contibute towards tears?

Answer 7

1. lacrimal
2. meibomian
3. harderian or nictitans

Question 8

What duct commonly gets blocked in rabbits?

Answer 8

nasolacrimal

Question 9

What helps reinforce the eye in avian species?

Answer 9

the sclerotic ring

Question 10

The eye can be divided into 3 (chambers and body), what are they?

Answer 10

1. anterior chamber
2. posterior chamber
3. vitreous body

Question 11

Hint: 3 parts

The eyeball comprises of what?

Answer 11

the sclera, uvea and retina

Question 12

What helps to improve night vision in animals?

Answer 12

Tapetum Lucidum

Question 13

What component controls the pupil to dilate and contract?

Answer 13

The iris

Question 14

What is the nerve supply to the iris?

Answer 14

Oculomotor nerve

Question 15

What is the function of the pupil?

Answer 15

Allows light into the retina.

Question 16

Define: Mydriasis & Miosis

Answer 16

Mydriasis - enlarged pupils
Miosis - small pupils

Question 17

What is the term given to a patient with different sized pupils?

Answer 17

Aniscoria

Question 18

What component of the eye focuses light onto the retina?

Answer 18

The Lens

Question 19

How is information trasmitted from the retina to the brain?

Answer 19

The optic nerve

Question 20

What are the two types of photoreceptors?

Answer 20

rods and cones

Question 21

Explain the formation of an image in 6 steps:

Answer 21

1. ight rays pass through cornea
2. light rays pass through pupil
3. light hits the lens and is reflected onto retina
4. light hits photoreceptors, nerve impulses sent to brain
5. info carried to brain is interpreted as an image
6. image formed on the retina is inverted but brain processes it the right way up.