ch. 15 17 Flashcards Preview

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Flashcards in ch. 15 17 Deck (143)
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121

eardrum

tympanic membrane

122

thin delicate sheet that separates external and middle ear

tympanic membrane

123

fx. vibrates with incoming sound waves

tympanic membrane

124

glands in skin of external acoustic meatus

ceruminous glands

125

fx. secrete ear wax

cerumen glands

126

tympanic cavity

middle ear

127

permits equalization of pressures on either side of tympanic membrane

auditory tube

128

what is the cause of otitis media

auditory tube allows microorganisms into middle ear

129

what are the auditory ossicles

malleus, incus, stapes

130

fx. carries vibrations of sound waves

auditory ossicles

131

where are the bony labyrinth and membranous labyrinth

internal ear

132

structures are surrounded by this bony structure (has receptors for hearing and equilibrium)

bony labyrinth

133

interconnected network of fluid filled tubes; inside of bony labyrinth and surrounded by fluid (perilymph)

membranous labyrinth

134

3 parts of the bony labyrinth

vestibule
3 semicircular canals
cochlea

135

fx. have receptors that provide sensations of gravity and linear acceleration

vestibule

136

fx. have receptors that are stimulated by rotation of the head

3 semicircular canals

137

fx. have receptors for hearing

cochlea

138

what is the significance of there being 3 semicircular ducts

each responding to one of the three rotational planes (anterior, posterior, and lateral)

139

where in the brain is equilibrium information is sent

on the vestibulocochlear nerve is sent to cerebellum and cerebral cortex

140

what is inside the cochlea

cochlear duct with spiral organ (organ of corti) which sits on basilar membrane

141

where are the hair cells

sit on basilar membrane and these hairs move against tectorial membrane and will cause sensory impulse

142

high frequency

short wavelength - vibrate nearer to oval window

143

low frequency

long wavelength- vibrate farther away from oval window