key terms
aqueous humor
A clear, watery fluid that fills the spave between the cornea and iris
conjunctiva
A mucous membrane that lines the eyelids and covers the front of the eye to provide additional protection and lubrication
lens
Is a circular structure located behind the pupil and suspended in position by ligaments
refracts
The bending of light rays as they pass through different mediums (such as cornea or lens)
vestibule
The central part of the inner ear that contains receptors for balance and works with the semicircular canals
auditory canal
The tube that carries sound waves from the outer ear to the tympanic membrane (eardrum)
cornea
A circular, transparent part of the front of the sclera
organ of corti
The sensory organ inside the cochlea that contains hair cells, which convert sound vibrations into nerve impulses
retina
The innermost layer of the eye and it is made of many layers of nerve cells, which transmit the light impulses to the optic nerve.
vitreous humor
Is the jellylike substance that fills the area behind the lens
auricle
The visible, external part of the ear that collects sound waves; also called the pinna
eustachian tube
A tube connecting the middle ear to the throat (phyranx) that equalizes air pressure on both sides of the tympanic membrane
ossicles
3 tiny bones in the middle ear the malleus incus and stapes that transmit and amplify sound vinrations from the eardrums to the inner ear
sclera
The tough, white outer layer of the eye that provides structure and protection
choroid coat
The middle layer of the eye and it is interlaced with many blood vessels that nourish the eyes
iris
Is the colored portion of the eye and it is located behind the cornea on the front of the choroid coat
pinna
Another term for the auricle the outer ear structure that ollects sound waves
semicircular canals
3 fluid-filled structures in the inner ear that help maintain balance and detect head movements
cochlea
a snail-shaped, fluid-filled structure in the inner ear that contains receptors for hearing
lacrimal glands
In the eye produce tears, which constantly moisten and cleanse the eye.
pupil
The opening in the center of the iris.
tympanic membrane
A thin membrane, also called the eardrum, that vibrates when sound waves strike it