The Auditory System Flashcards
Test confidence: you know all the anatomy?
Pinna
Ear canal
Tympanic membrane (ear drum)
sound travels through to hit these
Ossicles: Malleus, Incus, Stapes
these are all connected in mechanical linkage system to then push the membrane
Round window
takes pressure wave that’s transmitted through the system and pushes on this another membrane(don’t worry about name) which then pushes fluid in
Cochlea
inside cochlea has the sensory receptors that respond to movement, which then creates electrical signal to go to brain.
How does the tympanic membrane work?
Membrane like membrane on top of drum. How sound wave impacts structure.
What are the three ossicles in the ear?
Three smallest bones in body:
Malleus
Incus
Stapes
Define how sound waves work
Explain how sound transmission through the ear drum work.
What are the three fluid filled chambers in the ear?
The cochlear duct contains the organ of Corti, what is notable out it?
Anatomy of the Cochlea
Explain how fluid activates receptors?
Hair cells (Innervate by nerves) in basal membrane are touching Tectorial membrane. Fluid goes on tectorial membrane and moves it, thereby brushing the hairs stimulating the receptor. But how does this make action potential?
Explain how the hair cells in the ear produce action potentials .
Specialized sensory cell! Don’t have axons but release neurotransmitter.
What happens if hair cell receptors are damaged?
Hearing loss even if rest of the ear is fine!
Have a general understanding I guess.
How does the cochlea transform sound waves into electrical signals indicating pitch and loudness?
How do the auditory pathways project to the auditory cortex?
Primary vs Secondary
Bonus question: how do we localize sound? What is the requirement?
Explain the theory for sensory coding for pitch.
Define 1-4.
Test confidence:
