Chapter 17 Flashcards
normal adjustment of the eye to focus on objects from far to near
accomidation
the area behind the cornea and in front of the lend and iris
anterior chamber
fluid produced by the ciliary body and found in anterior chamber
aqueous humor
consisting of two surfaces that are rounded, elevated, and curved evenly; lens of the eye is biconvex
biconvex
middle, vascular layer of the eye, between the retina and the sclera
choroid
structure surrounding the lens that connects the choroid and iris; controls shape of lens and secretes aqueous humor
ciliary body
photoreceptor cell in the retina that transforms light energy into a nerve impulse; responsible for color and central vision
cone
delicate membrane that lines the undersurface of eyelids and covers anterior eyeball
conjunctiva
fibrous transparent layer of clear tissue that extends over the anterior portion of eyeball
cornea
tiny depression in the retina that is the region of clearest vision
fovea centralis
posterior, inner part of the eye
fundus of the eye
pigmented layer that opens and closes to allow more or less light into the eye
iris
transparent, biconvex body behind the pupil of the eye
lens
yellowish region on the retina lateral to and slightly below the optic disc
mascula
the point at which optic nerve fibers cross the brain
optic chiasm
the region at the back of the eye where the optic nerve meets the retina; blind spot
optic disc
cranial nerve carrying impulses from the retina to the brain
optic nerve
central opening of the eye, surrounded by the iris, through which light rays pass
pupil
bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina
refraction
light-sensitive nerve cell layer of the eye containing photoreceptor cells
retina
photoreceptor cell of retina essential for vision in dim light and for peripheral vision
rod
tough, white outer coat of the eyeball
sclera
relay center of the brain
thalamus
soft, jelly-like material behind the lens in the vitreous chamber
vitreous humor
channel that leads from the pinna to the eardrum
auditory canal
auditory canal
auditory meatus
carry impulses from the inner ear to the brain
auditory nerve fibers
channel between the middle ear and nasopharynx; Eustachian tube
auditory tube
flap of the ear; protruding part of external ear, or pinna
auricle
waxy substance secreted by the external ear; also called earwax
cerumen
snail-shaped, spirally wound tube i the inner ear
cochlea
fluid within the labyrinth of the inner ear
endolymph
auditory tube
eustachian tube
second ossicle of the middle ear
incus
maze-like series of canals of the inner ear
labyrinth
first ossicle of the middle ear
malleus
sensitive auditory receptor area found in the cochlea of the inner ear
organ of Corti
small bone of the ear
ossicle
membrane between the middle ear and the inner ear
oval window
fluid contained in the labyrinth of the inner ear
perilymph
auricle; flap of the ear
pinna
passages in the inner ear associated with maintaining equilibrium
semicircular canals
third ossicle of the middle ear
stapes
central cavity of the labyrinth, connecting the semicircular canals and the cochlea
vestibule
membrane between the outer and the meddle ear; eardrum
tympanic membrane
