LO6 Flashcards
Define pupil
Opening in middle of eye where light passes through
Define iris
visible coloured ring, adjusts the amount of light entering through the pupil
Define tear glands
produces tears to clean/lubricate eye
Defend against infection
Define aqueous/vitrous humerous
Jelly like fluid that fills eye keeping the eye’s shape
Define conjunctiva
Thin membrane which protects cornea
Define cornea
Front of eye which is transparent, light rays passes through cornea to retina
Define retina
Inner lining of eye, containing light sensitive cells
Define macula
High concentration of photoreceptor cells, detecting light and sending signals to the brain interpreting to images
Define optic nerve
Where nerve cells exit the eye going to the brain
Define ciliary muscle
Enables the lens to change shape for focusing. Contracting to stretch lens making it flatter/thinner
Define suspensory ligaments
Attached to lens to the ciliary muscle
Define lens
Focuses light entering the eye
Define eardrum
Thin layer of tissue that receives sound vibrations
Define Stapes/incus/malleus ear bones
Small bones that amplify the sound waves and transmit the vibrations across the middle of the ear to the cochlea
Define cochlea
Contains jelly like fluid in coiled tube, vibrations which are converted into neural messages then passed onto the brain
Define organ of corti
In cochlea, similar to a microphone lined with rows of hairs cells that convert sound vibration’s into nerve impulses
Define eustachian tube
Connects middle ear to throat, ensuring pressure in middle ear is equal to pressure outside the ear
Define round window
Drum like membrane, vibrations from oval window pass through to cochlea
Define auditory nerve
Bundle of nerves fibres that carry hearing information between cochlea and brain