B2: The Mammalian Eye- structure and function

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Iris
Coloured sheet of muscle which controls the amount of light that enters the eye by changing the size of the pupil
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Eyelid
Protects the eye from physical harm
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Cilliary Muscles
Changes the shape of the lens when they contract/ loosen
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Vitreous humour
Jelly- like fluid that is in the entire inside of the eye; it helps keep the shape of the eyeball and also bends the light onto the retina
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Retina
Layer of light sensitive cells which send impulses to the optic nerve
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Fovea
Small area of the retina which only contains cones
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Blind spot
A point at the back of the eye where the optic nerve is connected to the eye; there is no retina here
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Sclera
Tough, strong outer layer which protects the eye and has many blood vessels which supply the retina with oxygen and energy
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Chloroid
Dark, pigmented layer which absorbs light and stops it being reflected back into the eye
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Suspensory ligaments
Holds the lens in place and is connected to the cilliary muscles
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Lens
Clear disc which focuses the light onto the retina which allows a fine focus
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Pupil
The hole in the middle of the iris, which allows light to enter the eye
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Conjunctiva
Thin, clear protective layer over the surface of the eye
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Aqueous humour
Fluid that fills the front of the eye and helps bend light into the retina
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Cornea
Clear area of the sclera which helps to bend light onto the retina
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Aqueous humour
Fluid that fills the front of the eye and helps bend light into the retina
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Cornea
Clear area of the sclera which helps to bend light onto the retina
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Other cards in this set

Card 2

Front

Protects the eye from physical harm

Back

Eyelid

Card 3

Front

Changes the shape of the lens when they contract/ loosen

Back

Preview of the back of card 3

Card 4

Front

Jelly- like fluid that is in the entire inside of the eye; it helps keep the shape of the eyeball and also bends the light onto the retina

Back

Preview of the back of card 4

Card 5

Front

Layer of light sensitive cells which send impulses to the optic nerve

Back

Preview of the back of card 5
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