Function of Ch. 11

Question 1

eyebrow

Answer 1

each shades the eye

Question 2

upper and lower eyelids

Answer 2

protect the eyes from injury, sunlight, and drying

Question 3

eyelashes

Answer 3

shield the eyes

Question 4

conjunctiva

Answer 4

produces mucous that prevents the eyes from drying

Question 5

extrinsic eye muscles

Answer 5

moves the eyes, help maintain the shape of the eyes, and hold the eyes in the orbits

Question 6

lacrimal gland

Answer 6

produces lacrimal secretions

Question 7

lacrimal sac

Answer 7

passageway for tears

Question 8

nasolacrimal duct

Answer 8

passageway for tears

Question 9

fibrous tunic consists of

Answer 9

the sclera and the cornea

Question 10

what protects internal structures, maintains the shape of the eyeball, provides a sturdy site for the attachment of extrinsic eye muslces, commonly called the white of the eye

Answer 10

sclera

Question 11

cornea

Answer 11

refracts light

Question 12

wha tis in the vascular tunic

Answer 12

iris, pupil, ciliary body, choroid

Question 13

iris

Answer 13

regulates the size of a pupil; smooth muscle

Question 14

pupil

Answer 14

passageway for light

Question 15

ciliary body

Answer 15

regulates lens shape and secretes aqaueous humor; smooth muscle

Question 16

choroid

Answer 16

absorbs light rays

Question 17

produces signals in response to light

Answer 17

retina or nervous tunic

Question 18

optic nerve

Answer 18

signals about vision travel along it to the optic chiasm

Question 19

fibrous tunic is composed of what

Answer 19

dense connective tissue

Question 20

optic nerve CNII

Answer 20

signals about vision travel along optic chiasm

Question 21

lens

Answer 21

refracts light as it passes through ; avascular

Question 22

aqueous humor

Answer 22

maintains intraocular pressure, eye shape, provides nutrition for the lens and cornea

Question 23

vitreous humor

Answer 23

transmits light, holds the retina against the choroid, contributes to intraocular pressure

Question 24

external ear consist of

Answer 24

auricle and acoustic meatus

Question 25

auricle

Answer 25

collects sound waves and directs them into the external acoustic meatus -composed of skin and elastic cartilage

Question 26

external acoustic meatus

Answer 26

- passageway for sound waves | - porton of tunnel is elastic cartilage other portion is bone both are lined with skin

Question 27

tympanic membrane

Answer 27

- commonly called eardrum - connective tissue - sound waves cause it to vibrate which moves the auditory ausicles

Question 28

auditory ossicles

Answer 28

-amplify and transmit vibrations to the internal ear

Question 29

malleus

Answer 29

- lateral ossicle - attaches to tympanic membrane - articulates with the incus

Question 30

incus

Answer 30

middle ossicle | -articulates with the malleus and stapes

Question 31

stapes

Answer 31

medial ossicle | -articulates with the incus and attaches to the oval window

Question 32

pharyngotympanic tube

Answer 32

- opens when swallowing or yawning | - causes air pressure in the middle ear to be equal to the pressure of the atmospheric air

Question 33

bony labyrinth

Answer 33

vestibule, semicircular canal, cochlea

Question 34

vestibule

Answer 34

contains the membranous labyrinth

Question 35

oval window

Answer 35

transmits the vibrations of the ossicles to the perilymph

Question 36

semicircular canal

Answer 36

contain the membranous labyrinth

Question 37

cochlea

Answer 37

contains membranous labyrinth

Question 38

round window

Answer 38

a safety valve that prevents rupture of the cochlear duct

Question 39

scala vestibuli

Answer 39

- upper tube - contains perilymph - part of the bony labyrinth

Question 40

vestibular membrane

Answer 40

separates the scala vestibule and the cochlear duct | -part of the bony labyrinth

Question 41

cochlear duct

Answer 41

middle tube - contains endolymph - part of the membranous labyrinth

Question 42

tectorial membrane

Answer 42

overlies the spiral organ

Question 43

spiral organ

Answer 43

- sits on the basilar membrane | - sensory receptors for hearing are located here

Question 44

basilar membrane

Answer 44

separates the cochlear duct and scala tympani

Question 45

scala tympani

Answer 45

lower tube - contains perilymph - part of the bony labyrinth

Question 46

semicircular canal contains what

Answer 46

perilymph

Question 47

semicircular duct contains what

Answer 47

endolymph

Question 48

ampulla

Answer 48

contains the sensory receptors for equilibrium

Question 49

vestibule contains what

Answer 49

contains perilymph

Question 50

utricle is part of the _____ labirynth and contains what

Answer 50

membranous labyrinth | -contains endolymph and sensory receptors for equilibrium

Question 51

saccule; what labirynth and contains what

Answer 51

- membranous | - contains endolymph and sensory receptors for equilibrium

Question 52

cranial nerve 8

Answer 52

carries signals from the inner ear to the brain

Question 53

vestibular nerve

Answer 53

carries signals from the utricle, saccule, and semicircular ducts to the brain

Question 54

cochlear nerve

Answer 54

carries signals from the cochlea to the brain