4.5 Nervous system: TRIPLE The brain and the eye Flashcards
The largest part of the brain is called the…
Cerebrum
The outer part of the cerebrum is called the…
Cerebral Cortex
The cerebellum co-ordinates..
..muscle movement
The medulla oblongata controls…
..unconscious activities (eg heart rate, breathing rate)
The function of the temporal lobe is…
..to provide visual memories and process language
Broca (1824-1880) is best known for his work on which part of the brain?
Frontal Lobe
Which part of the eye contains the light sensitive receptors?
Retina
Name the receptor cells that can detect low levels of light
Rods
Name the receptor cells that allow colour vision
Cones
Name the receptor cells that allow clear daytime vision
Cones
At night, colour vision is less vivid because which receptor is not stimulated?
Cones
Name the tough outer skin of the eye
Sclera
Name the curved front part of the eye ball that refracts light through the pupil
Cornea
What is ‘accommodation’
The lens changing shape to focus on near or far objects
Focussing on far objects:
Your ciliary muscles (contract/relax)?
RELAX!
Focussing on far objects:
Your lens is (long and thin/short and fat)
Longer and thinner
Focussing on near objects:
Your ciliary muscles (contract/relax)?
CONTRACT!
Focussing on near objects:
Your lens is (long and thin/short and fat)
Shorter and fatter
Long sightedness is otherwise known as..
..HYPEROPIA
Short sightedness is otherwise known as,,
..MYOPIA
If you are long sighted, what can you not see very well
Objects that are close to you
If you are short sighted, what can you not see very well
Objects that are far from you
What is the function of the optic nerve
Transmits electrical impulses from the eyes to the brain
Name the layer of the eye that provides oxygen and nourishment to the retina cells
Choroid
Which part of the eye controls the size of the pupil
Iris
Which part of the retina provides the sharpest vision (has the highest number of cones) when light hits it
Fovea
This structure is made of muscle so contracts and relaxes to change the shape of the lens
Ciliary Body
Correctives spectacles or lens treat long and short sightedness by doing what?
Refracting light before it enters our eyes
Name a permanent solution to treating long or short sightedness
Laser surgery (to change the shape of the cornea)
