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Med.Term C17 Vocab

Chabner, Language of Medicine 11th edition-Chapter 17 Vocabulary

VocabularyMeaning
accommodation Normal adjustment of the eye to focus on objects from far to near
anterior chamber The area behind the cornea and in front of the lens and iris
aqueous humor Fluid produced by the ciliary body and found in anterior chamber
auditory canal Channel that leads from the pinna to the eardrum
auditory meatus Auditory canal
auditory nerve fibers Carry impulses from the inner ear to the brain
auditory tube Channel between the middle ear and nasopharynx; eustachian tube
auricle Flap of the ear; protruding part of external ear, or pinna
biconvex Consisting of two surfaces that are rounded, elevated, and curved evenly; lens of the eye is biconvex
cerumen Waxy substance secreted by the external ear; also called earwax
choroid Middle, vascular layer of the eye, between the retina and the sclera
ciliary body Structure surrounding the lens that connects the choroid and iris; controls shape of lens and secretes aqueous humor
cochlea Snail-shaped, spirally wound tube in the inner ear
cone Photoreceptor cell in the retina that transforms light energy into a nerve impulse; responsible for color and central vision
conjunctiva Delicate membrane that lines the undersurface of eyelids and covers anterior eyeball
cornea Fibrous transparent layer of clear tissue that extends over the anterior portion of eyeball
endolymph Fluid within the labyrinth of the inner ear
eustachian tube Auditory tube
fovea centralis Tiny depression in the retina that is the region of clearest vision
fundus of the eye Posterior, inner part of the eye
incus Second ossicle of the middle ear
iris Pigmented layer that opens and closes to allow more or less light into the eye
labyrinth Maze-like series of canals of the inner ear
lens Transparent, biconvex body behind the pupil of the eye
macula Yellowish region on the retina lateral to and slightly below the optic disc
malleus First ossicle of the middle ear
optic chiasm The point at which optic nerve fibers cross in the brain
optic disc The region at the back of the eye where the optic nerve meets the retina; blind spot
optic nerve Cranial nerve carrying impulses from the retina to the brain
organ of Corti Sensitive auditory receptor area found in the cochlea of the inner ear
ossicle Small bone of the ear
oval window Membrane between the middle ear and the inner ear
perilymph Fluid contained in the labyrinth of the inner ear
pinna Auricle; flap of the ear
pupil Central opening of the eye, surrounded by the iris, through which light rays pass
refraction Bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina
retina Light-sensitive nerve cell layer of the eye containing photoreceptor cells
rod Photoreceptor cell of retina essential for vision in dim light and for peripheral vision
sclera Tough, white outer coat of the eyeball
semicircular canals Passages in the inner ear associated with maintaining equilibrium
stapes Third ossicle of the middle ear
thalamus Relay center of the brain
tympanic membrane Membrane between the outer and the middle ear; eardrum
vestibule Central cavity of the labyrinth, connecting the semicircular canals and the cochlea
vitreous humor Soft, jelly-like material behind the lens in the vitreous chamber
 



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