The Mammalian Eye Flashcards

1
Q

Sclera

A

Fibrous layer that protects the eyeball and allows for attachment of external muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Choroid

A

Vascular pigmented layer which absorbs light and prevent internal reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Retina

A

Photoreceptors layer containing rods and cones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Fovea

A

Region of retina only containing only cones with lots of photoreceptors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Optic nerve

A

Transmits impulses to the brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Blind spot

A

Region of retina lacking both rods and cones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Vitreous humour

A

Jelly like fluid in the chamber of the eye that maintains the shape of the eyeball

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Ciliary body

A

Contains circular muscle that alter the shape of the lens during focusing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Iris

A

Controls the size of the pupil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Pupil

A

Circular opening for directing light to the lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Cornea

A

Transparent portion of sclera across which the greatest refraction of light occurs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Conjunctiva

A

Membrane that lines the eyelids and protects the cornea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Aqueous humour

A

Watery fluid that fills the anterior chamber of the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Suspensory ligaments

A

Attach the lens to the ciliary body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Explain how we see (4)

A

1.light is focused onto retina by the lens 2. Light is absorbed by pigments in the photoreceptors 3. Causes sim of the sodium ion channels to open (generator potential) 4. If threshold is reached,-action potential- bipolar neurone-optic nerve-brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Rods

A
Monochromatic- one pigment so b+w
More sensitive to low light
Low visual acuity 
Mostly in the peripheral part of the retina 
Many rods share a single bipolar neurone
17
Q

Cones

A

Trichromatic- red/blue/green
Less sensitive to low light
Higher visual acuity
Each cone has its own bipolar neurone