Ear Flashcards
2 parts of auditory system
CENTRAL AUDITORY NERVOUS SYSTEM; PERIPHERAL AUDITORY NERVOUS SYSTEM
From Cochlear nucleus to primary auditory cortex
Central ANS
CN VIII
Auditory Nerve
Auditory nerve is a ____ process
neural
auditory nerve function
Transmits auditory and vestibular info from ear to brain
collection of auditory nerve fibers
Spiral ganglion
Peripheral ANS consists of
outer, middle, inner ear
Outer ear is a _____ process
acoustic
pinna function
sound localization
External auditory meatus function
sound amplifier
outer ear terminates at
tympanic membrane
Cerumen function
traps and repels
Outer ear function
resonator and amplifier
Middle ear is a _____ process
mechanical
3 layers of tympanic membrane
epidermal, fibrous, and membranous
ossicular chain
malleus, incus, stapes
2 middle ear muscles
Stapedius (CN VII) Tensor tympani (CN V)
Opens to equalize pressure
Eustachian Tube
Middle ear function
conduction, protection
Inner ear is a ______ process
Hydromechanical, Chemical
2 subdivisions of cochlea
Osseous bony cochlea
Membranous cochlea
Inner ear function
converts mechanical sound waves to electrical activity and neural impulses
testing that measures the range and sensitivity of an individual’s hearing
Audiometry
in air conduction testing, sounds go
through outer and middle ear
presentation of pure tone testing
headphones, external
When air conduction threshold in one ear exceeds bone conduction threshold in contralateral ear by 40dB HL or more
Air conduction masking