Nervous System - Parts of the Eye

Question 1

Iris -

Answer 1

coloured sheets of muscle which controls amount of light that enters the eye by changing the size of the pupil

Question 2

Pupil -

Answer 2

The hole in the middle of the iris through which light enters enters the eye

Question 3

Cornea -

Answer 3

clear area of the sclera which helps to refract the light a little onto the retina

Question 4

Sclera -

Answer 4

• tough, strong outer layer of eye which protects the internal working parts of the eye
• has many blood vessels to supply retina with oxygen and food

Question 5

Lens -

Answer 5

• clear disc which refracts majority of light onto the retina - fine focus

Question 6

Vitreous humour -

Answer 6

• jelly - like fluid which helps keep the structure/shape of the eyeball
• refracts light onto the retina

Question 7

Retina -

Answer 7

• Layer of light sensitive cells contain receptor cells and send impulses to the optic nerve

Question 8

Ciliary muscles -

Answer 8

• circular ring of muscle that change the shape of the lens by relaxing and contracting

Question 9

Suspensory ligaments -

Answer 9

• Connect the ciliary muscles to the lens
• hold the lens in place.

Question 10

Aqueous humour -

Answer 10

• **fluid* that fills the front of the eye
• helps to refract light onto retina