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iris the pigmented, involuntary muscle that acts as the diaphragm of the eye.
sclera the firm white fibrous outer layer of the eyeball; protects and maintains eyeball shaper
lacrimal gland the gland that creates tears
conjunctiva the thin, protective mucous membrane lining the eyelids and covering the anterior surface of the eyeball
optic nerve nerve connected to the eye; composed of ganglion cell axons
lens the elastic, doubly convex structure in the eye that focuses the light entering the eye on the retina
cornea the transparent anterior portion of the eyeball
pupil an opening in the center of the iris through which light enters the eye
aqueous humor the watery fluid in the anterior chambers of the eye
vitreous humor liquid that helps the eyeball from collapsing inward y reinforcing it internally
optic disc the place in the retina where the optic nerve leaves the eyeball
retina light sensitive layer of the eye; contains rods and cones
choroid the pigmented nutritive layer of the eye
suspensory ligament fibrous ligament that holds the lens in place in the eye
rod one of two types of photosensitive cells in the retina
cone one of the two types of photoreceptor cells in the retina of the eye. provides for color vision
photoreceptor specialized receptor cells that respond to light energy
fovea centralis central pit
refraction a bend in light
magnification the process of making something appear larger, as by use of lenses.
astigmatism a visual defect resulting from irregularity in the lens or cornea of the eye causing the image to be out of focus
hyperopia farsightedness
myopia nearsightedness
pinna the shell-shaped stucture surrounding the auditory canal opening
tympanic membrane the eardrum
eustation tube runs obliquely downward to link the middle ear cavity with the throat
malleous bone in the ear which moves when the eardrum moves and transfers the vibrations to the anvil.
incus passes vibration to the stapes.
stapes presses on the oval window of the inner ear.
oval window (round window) openings in a bon wall by the tempanic cavity
cochlea a cavity of the inner ear resembling a snail shell; housing the hearing receptor
semicircular canals canals inside the ear, resembling a semicircle, towards the top
vestibule situated between the semicircular canals and the cochlea
auditory nerve the nerve that comes from the ear
equilibrium (as it pertains to balance) a state when opposite reactions or forces counteract each other exactly
tinnitus hearing ringing, buzzing, or other sounds without an external cause
chemoreceptor receptors sensitive to various chemicals in a soution
olfactory receptor receptors or the sense of smell
olfactory nerve travels from the nose to the brain
taste bud receptors used for taste on the tongue, roof of mouth, pharynx and laynx.
Created by: Tessa Elise



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