2.86 Eye

describe the structure and function of the eye as a receptor

Source: http://learning.royallatin.bucks.sch.uk/file.php/163/assets/images/ks4/Eye.gif

Choroid - Black layer containing a high concentration of blood vessels
Vitreous humour - Transparent jelly-like substance which supports the back of the eye
Retina - Inner light-sensitive layer which contains rod cells that work in dim light and cone cells that detect colour and details
Yellow spot or fovea - Most sensitive part of the retina
Blind spot - Point where the optic nerve attaches to the eyes; no light-sensitive cells
Optic nerve - Carries nerve impulses away to the brain
Sclerotic - Tough, white, protective layer
Suspensory ligaments - Holds the lens in place
Iris - Controls the amount of light entering the eye
Lens - Can change its shape to focus light onto the retina
Aqueous humour - Watery liquid filling the front of the eye
Cornea - Shields the eye from germs, dust, etc.
Conjunctiva - Helps lubricate the eye by producing mucus and tears
Ciliary muscle - Changes the thickness of the lens when focusing

- lie in sockets in the skull
- controlled by three pairs of eye muscles
- receptor of light