Chapter 17

Question 1

normal adjustment of the eye to focus on objects from far to near

Answer 1

accomidation

Question 2

the area behind the cornea and in front of the lend and iris

Answer 2

anterior chamber

Question 3

fluid produced by the ciliary body and found in anterior chamber

Answer 3

aqueous humor

Question 4

consisting of two surfaces that are rounded, elevated, and curved evenly; lens of the eye is biconvex

Answer 4

biconvex

Question 5

middle, vascular layer of the eye, between the retina and the sclera

Answer 5

choroid

Question 6

structure surrounding the lens that connects the choroid and iris; controls shape of lens and secretes aqueous humor

Answer 6

ciliary body

Question 7

photoreceptor cell in the retina that transforms light energy into a nerve impulse; responsible for color and central vision

Answer 7

cone

Question 8

delicate membrane that lines the undersurface of eyelids and covers anterior eyeball

Answer 8

conjunctiva

Question 9

fibrous transparent layer of clear tissue that extends over the anterior portion of eyeball

Answer 9

cornea

Question 10

tiny depression in the retina that is the region of clearest vision

Answer 10

fovea centralis

Question 11

posterior, inner part of the eye

Answer 11

fundus of the eye

Question 12

pigmented layer that opens and closes to allow more or less light into the eye

Answer 12

iris

Question 13

transparent, biconvex body behind the pupil of the eye

Answer 13

lens

Question 14

yellowish region on the retina lateral to and slightly below the optic disc

Answer 14

mascula

Question 15

the point at which optic nerve fibers cross the brain

Answer 15

optic chiasm

Question 16

the region at the back of the eye where the optic nerve meets the retina; blind spot

Answer 16

optic disc

Question 17

cranial nerve carrying impulses from the retina to the brain

Answer 17

optic nerve

Question 18

central opening of the eye, surrounded by the iris, through which light rays pass

Answer 18

pupil

Question 19

bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina

Answer 19

refraction

Question 20

light-sensitive nerve cell layer of the eye containing photoreceptor cells

Answer 20

retina

Question 21

photoreceptor cell of retina essential for vision in dim light and for peripheral vision

Answer 21

rod

Question 22

tough, white outer coat of the eyeball

Answer 22

sclera

Question 23

relay center of the brain

Answer 23

thalamus

Question 24

soft, jelly-like material behind the lens in the vitreous chamber

Answer 24

vitreous humor

Question 25

channel that leads from the pinna to the eardrum

Answer 25

auditory canal

Question 26

auditory canal

Answer 26

auditory meatus

Question 27

carry impulses from the inner ear to the brain

Answer 27

auditory nerve fibers

Question 28

channel between the middle ear and nasopharynx; Eustachian tube

Answer 28

auditory tube

Question 29

flap of the ear; protruding part of external ear, or pinna

Answer 29

auricle

Question 30

waxy substance secreted by the external ear; also called earwax

Answer 30

cerumen

Question 31

snail-shaped, spirally wound tube i the inner ear

Answer 31

cochlea

Question 32

fluid within the labyrinth of the inner ear

Answer 32

endolymph

Question 33

auditory tube

Answer 33

eustachian tube

Question 34

second ossicle of the middle ear

Answer 34

incus

Question 35

maze-like series of canals of the inner ear

Answer 35

labyrinth

Question 36

first ossicle of the middle ear

Answer 36

malleus

Question 37

sensitive auditory receptor area found in the cochlea of the inner ear

Answer 37

organ of Corti

Question 38

small bone of the ear

Answer 38

ossicle

Question 39

membrane between the middle ear and the inner ear

Answer 39

oval window

Question 40

fluid contained in the labyrinth of the inner ear

Answer 40

perilymph

Question 41

auricle; flap of the ear

Answer 41

pinna

Question 42

passages in the inner ear associated with maintaining equilibrium

Answer 42

semicircular canals

Question 43

third ossicle of the middle ear

Answer 43

stapes

Question 44

central cavity of the labyrinth, connecting the semicircular canals and the cochlea

Answer 44

vestibule

Question 45

membrane between the outer and the meddle ear; eardrum

Answer 45

tympanic membrane