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116 Cards in this Set
- Front
- Back
accommodation
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Normal adjustment of the eye to focus on objects from far to near. The ciliary body adjusts the lens (rounding it) and the pupil constricts. When the eye focuses from near to far, the ciliary body flattens the lens and the pupil dilates.
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anterior chamber
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Area behind the cornea and in front of the lens and iris. It contains aqueous humor.
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aqueous humor
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Fluid produced by the ciliary body and found in the anterior chamber. A humor is any fluid, including blood and lymph.
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biconvex
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Consisting of two surfaces that are rounded, elevated, and curved evenly, like part of a sphere.
The lens of the eye is a biconvex body. |
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choroid
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Middle, vascular layer of the eye, between the retina and the sclera.
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ciliary body
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Structure surrounding the lens that connects the choroid and iris. It contains ciliary muscles, which control the shape of the lens, and it secretes aqueous humor.
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cone
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Photoreceptor cell in the retina that transforms light energy into a nerve impulse.
Cones are responsible for color and central vision. |
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conjunctiva
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Delicate membrane lining the undersurface of the eyelids and covering the anterior eyeball.
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cornea
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Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball.
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fovea centralis
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Tiny pit or depression in the retina that is the region of clearest vision.
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fundus of the eye
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Posterior, inner part of the eye.
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iris
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Pigmented (colored) layer that opens and closes to allow more or less light into the eye.
The central opening of the iris is the pupil. |
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lens
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Transparent, biconvex body behind the pupil of the eye.
It bends (refracts) light rays to bring them into focus on the retina. |
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macula
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Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the area of clearest vision.
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optic chiasm
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Point at which optic nerve fibers cross in the brain.
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optic disc
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Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light.
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optic nerve
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Cranial nerve carrying impulses from the retina to the brain (cerebral cortex).
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pupil
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Central opening of the eye, surrounded by the iris, through which light rays pass. It appears dark.
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refraction
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Bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina.
Refract means to break. |
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retina
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Light-sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones).
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rod
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Photoreceptor cell of the retina essential for vision in dim light and for peripheral vision.
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sclera
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Tough, white outer coat of the eyeball.
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thalamus
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Relay center of the brain. Optic nerve fibers pass through the thalamus on their way to the cerebral cortex.
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vitreous humor
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Soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball.
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aque/o
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water
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blephar/o
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eyelid
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conjunctiv/o
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conjunctiva
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cor/o
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pupil
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corne/o
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cornea
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cycl/o
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ciliary body or muscle of the eye.
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dacry/o
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tears, tear duct
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ir/o, irid/o
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iris (colored portion of the eye around the pupil.
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kerat/o
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cornea
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lacrim/o
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tears
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ocul/o
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eye
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ophthalm/o
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eye
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opt/o, optic/o
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eye, vision
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palpebr/o
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eyelid
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papill/o
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optic disc; nipple-like
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phac/o, phak/o
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lens of the eye
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pupill/o
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pupil
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retin/o
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retina
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scler/o
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sclera (white of the eye); hard
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uve/o
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uvea; vascular layer of the eye (iris, ciliary body, and choroid)
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vitre/o
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glassy
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ambly/o
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dull, dim
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dipl/o
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double
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glauc/o
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gray
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mi/o
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smaller, less
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mydr/o
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widen, enlarge
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nyct/o
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night
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phot/o
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light
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presby/o
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old age
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scot/o
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darkness
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xer/o
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dry
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-opia
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vision
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-opsia
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vision
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-tropia
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to turn
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astigmatism
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Defective curvature of the cornea or lens of the eye.
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hyperopia
(hypermetropia) |
Farsightedness
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myopia
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Nearsightedness
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presbyopia
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Impairment of vision as a result of old age.
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cataract
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Clouding of the lens, causing decreased vision.
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chalazion
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Small, hard, cystic mass (granuloma) on the eyelid.
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diabetic retinopathy
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Retinal effects of diabetes mellitus include micro aneurysms, hemorrhages, dilation of retinal veins, and neovascularization (new blood vessels form in the retina).
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glaucoma
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Increased intraocular pressure results in damage to the retina and optic nerve with loss of vision.
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hordeolum
(stye or sty) |
Localized purulent, inflammatory staphylococcal infection of a sebaceous gland in the eyelid.
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macular degeneration
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Progressive damage to the macula of the retina.
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nystagmus
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Repetitive rhythmic movements of one or both eyes.
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retinal detachment
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Two layers of the retina separate from each other.
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strabismus
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Abnormal deviation of the eye.
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auditory canal
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Channel that leads from the pinna to the eardrum.
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auditory meatus
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Auditory canal.
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auditory nerve fibers
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Carry impulses from the inner ear to the brain (cerebral cortex).
These fibers compose the vestibulocochlear nerve (cranial nerve VIII). |
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auditory tube
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Channel between the middle ear and the nasopharynx; eustachian tube.
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auricle
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Flap of the ear; the protruding part of the external ear, or pinna.
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cerumen
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Waxy substance secreted by the external ear; also called ear wax.
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cochlea
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Snail-shaped, spirally would tube in the inner ear; contains hearing-sensitive receptor cells.
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endolymph
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Fluid within the labyrinth of the inner ear.
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eustachian tube
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Auditory tube.
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incus
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Second osscile (bone) of the middle ear.
incus means anvil. |
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labyrinth
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Maze-like series of canals of the inner ear. This includes the cochlea, vestibule, and semicircular canals.
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malleus
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First ossicle of the middle ear;
malleus means hammer. |
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organ of Corti
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Sensitive auditory receptor area found in the cochlea of the inner ear.
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ossicle
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Small bone of the ear; includes the malleus, incus, and stapes.
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oval window
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Membrane between the middle ear and the inner ear.
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perilymph
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Fluid contained in the labyrinth of the inner ear.
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pinna
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Auricle; flap of the ear.
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semicircular canals
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Passages in the inner ear associated with maintaining equilibrium.
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stapes
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Third ossicle of the middle ear.
Stapes means stirrup. |
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tympanic membrane
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Membrane between the outer and the middle ear; also called the eardrum.
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vestibule
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Central cavity of the labyrinth, connecting the semicircular canals and the cochlea.
The vestibule contains two structures, the saccule and utricle, that help to maintain equilibrium. |
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acous/o
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hearing
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audi/o
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hearing; the sense of hearing
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audit/o
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hearing
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aur/o, auricul/o
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ear
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cochle/o
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cochlea
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mastoid/o
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mastoid process
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myring/o
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eardrum, tympanic membrane
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ossicul/o
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ossicle
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ot/o
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ear
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salping/o
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eustachian tube, auditory tube
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staped/o
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stapes (third bone of the middle ear)
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tympan/o
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eardrum,
tympanic membrane |
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vestibul/o
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vestibule
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-acusis or -cusis
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hearing
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-meter
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instrument to measure
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-otia
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ear condition
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acoustic neuroma
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Benign tumor arising from the acoustic vestibulocochlear nerve (eighth cranial nerve) in the brain.
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cholesteatoma
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Collection of skin cells and cholesterol in a sac within the middle ear.
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deafness
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Loss of the ability to hear.
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Meniere disease
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Disorder of the labyrinth of the inner ear; elevated endolymph pressure within the cochlea (cochlea hydrops) and semicircular canals (vestibular hydrops).
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otitis media
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Inflammation of the middle ear.
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otosclerosis
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Hardening of the bony tissue of the middle ear.
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tinnitus
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Sensation of noises (ringing, buzzing, whistling, booming) in the ears.
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vertigo
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Sensation of irregular or whirling motion either of oneself or of external objects.
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