LO6 Flashcards
what is the pupil
opening at the middle of the eye which light passes through
what is the iris
the visible coloured ring at the front of the eye. it adjusts to control the amount of light entering the pupil.
what is the tear glands
lacrimal glands
produce tears to lubricate and clean the front if the eye. fluid contains salt and has natural antiseptic properties
what are the aqueous and vitreous humours
(or fluids) watery, jelly-like fluids that fill the eye. they keep the eyes shape and nourish it.
what is the conjunctiva
thin membrane that protects the cornea
what is the cornea
is at the front of the eye and transparent
light passes through the cornea to retina
what is the retina
the inner lining of the eye, contains light sensitive cells called rods and cones
what is the macula
high concentration of photoreceptor cells , these detect light and sends signals to the brain, which interprets them as images
what is the optic nerve
nerve cells exit the eye
no rods and cones so called the blind spot
ciliary muscles
enables the lens to change shape for focusing
it contracts to stretch the lens making it flatter and thinner
what are the suspensory ligaments
attach the lens to the ciliary muscle
what is the lens
focusing light enters the eye
what are the parts of the ear
eardrum
stapes/icus/malleus- ear bones
cochlea
organ of corti
eustachian tube
round window
auditory nerve
semi circular canals and ampullae
what is the ear drum
thin layer of tissue that receives the sound vibrations and transmits them to the middle ear
what is the stapes/incus/malleus
small bones that amplify the sound waves and transmit them across the middle ear to the cochlea