Physiology Of Hearing Flashcards
What are sound waves
Anything that vibrates in an elastic medium
What is infrasound
Sounds below frequency of perception
What is ultrasound
Sounds above the frequency of perseption
What is sound frequency measured in
Hz
What is sound transduction
Vibrations from tympanic membrane to inner ear via ossicles
Which ossicle is bound to the tympanic membrane
Malleus
What binds the incus and malleus
Minute ligament
Where does the stapes lie
At the membranous labyrinth
How do cochlear impulses get transmitted
By cochlea nerve (branch of vestibulocochlear nerve)
Describe the structure of the cochlea
Coiled labyrinth with 3 fluid filled chambers: Scala vestibuli, Scalia media, Scala tympani
What fluid filled the Scala vestibuli
Perilymph
What fluid fills the scala media
Endolymph
Where does the scala vestibuli start and end
Starts at oval window, ends ar round window
Which is the upper canal
Scala vestibuli
How is the scalar vestibuli deprecated from the scala media
Reinsers membrane
How is the scala media separated from the scala tympani
Basement membrane
What is the tectorial membrane
Extracellular matrix that stands the length of the cochlea
what is the organ of corti
The sensory region of the cochlear between the Calgary tympani and scalar media
What are sensory hairs called
Stereocili
What region of the ear is responsible for balance
Semi-circular Canals
Otolith organs (aka utricle and suckle) (just below semicircular canals)
Which otolith organ senses horizontal acceleration
Utricle
What otolith organ senses vertical acceleration
Saccule
How is balance sensed
The vestibular system (semicircular canals + otolith organs)
contain endolymph and gel containing CaCO3 crystals
Stereocili hairs move in the gel to sens
What do semicircular canals detect
Angular acceleration
