Hearing Flashcards

Auricle or Pinnae

the external portion of the ear

external acoustic meatus

ear canal

tympanic membrane

ear drum

ceruminous glands produces

ear wax- cerumen

the middle ear encloses and protects the

auditory ossicles

the auditory ossicles are

the malleus, incus, and stapes

the oval window is connected to the


tensor tympanic muscle

stiffens the malleus and tympanic membrane

stapedius muscle

reduces movement of the stapes on the oval window

the membranous labrynth contains


endolymph is similar to

intracellular fluid

the endolymph has high levels of

potassium- 110

the sodium concentration in endolymph has very low levels of

sodium- 20

the bony labrynth is surrounded by


perilymph is similar to


the vestibular complex gives us a sense of


the vestibule contains the

utricle and saccule

the utricle and saccule are for our sense of

gravity, linear acceleration

the semicircular canals give sense of


the cochlea gives sense of


receptor cells for hearing are located in the

cochlear duct

the cochlear duct has high levels of


the three chambers of the cochlea in order are

scala vestibuli, cochlear duct, scala tympani

the vestibular duct (scala vestibuli) recieves vibration from

the stapes and oval window

the scala vestibuli contains


the scala tympani contains


hair cells can be found in the

Organ of Corti located within the Cochlear duct

intensity of sound depends on

the number of hair cells activated and how much energy it contains

frequency depends on

cycles per second and which region is activated

the round window separates

the perilymph from the air spaces of the middle ear

hair cells are

basic receptors of the inner ear

hair cells contain


high pitch frequencies are found

at the base of the cochlea

low pitch frequencies are found

at the tip (apex) of the cochlea

sensory neurons for hearing are located in the

spiral ganglion (first order neurons)

the cochlear nucleus is a

second order neuron

the inferior colliculus of the mesencephalon is a

third order neuron

the thalamus is a

fourth order neuron

the inferior colliculus gives us reflexes that respond to


when hair cells bend, they


when hair cells straighten out

they stop depolarizing