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Chapter 17 Chabner
Vocabulary
| Term | Definition |
|---|---|
| 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 jmpulses 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 |
| bicovex | 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 he sclera |
| ciliary body | Structure surrounding the lens that connects the choroid and iris; controls shape of lens and 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 coves 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 cochela |
| vitreous humor | Soft, jelly-like material behind the lens in the vitreous chamber |
Created by:
JCA
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