The ear
No description yet. This curated deck is ready for daily study.
Card preview (11)
Outer Ear -what is the pinna? what is it’s function? -what is the auditory cancal, and what does it produce? -where does the outer ear end?
-the pinna is the external ear and it colects sound and funnels it down the canal -the canal is a narrow tube that concentrates sound, and it produces earwax -tympanum
Middle Ear -where does it begin -what are the 3 bones attached to the tympanum. Where are they found?
-tympanum -ossicles, they are found in an air filled chamber
Function of middle ear What does it convert sound energy into? -what happens when sound waves hit the tympanum -what does the last ossicle do
-mechanical energy -vibrations result and move through the ossicles -the last one strikes an inner membrane called the oval window on the cochlea
Function of middle ear what does it do to the sound as it moves towards the inner ear? -how is energy concentrated, and what does this do to the force of movement onto the oval window?
-it is amplified -it is concentrated from the large tympanum to the small oval window, triple the force of movement
Function of middle ear Protection from what? -what do muscles do in loud sounds -what is pulled away from the oval window, and what does it result in
excessive noise -restrict movement of the ossicles -stapes, decreased intensity on the cochlea
Function of middle ear equalizing what? -what are the conditions for the tympanum to vibrate freely -what does the eustacian tube do?
air pressure -equal pressure on both sides -opens and closes to equalizing air pressure
Inner ear -3 parts and their basic function
• cochlea- hearing • semicircular canals-balance when moving 3.vestibule: balance when stationary
Cochlea -what cells does it contain (specifically located where), and what do they do -what direction do the vibrations of ossicles push the oval window, and what does that cause -how is pressure relieved after -what do the hair cells sense -what can the hair cells distinguish between
-specialized hair cells in the organ of corti -inwards which causes the oval window to be pushed inwards and cause fluid movement -the round window is pushed outwards by the fluid -bending of the cilliar and synapse with the nerve fibres of auditory nerve -between frequency and amplitude
Frequency -what do high vs low do t the hair cells
high: stimulate hair cells closest to the oval window low:stimulate hair cells farthest from the oval window
Amplitutde -what happens when the noise is louder
greater pressure on the fluid in the cochlea on the hair cells
Semicircular canals -3 of what -what do their sensitive hair cells detect -function
-fluid filled bone chambers -motion of fluids in the canals and synapse with the vestibules -detect change in motion, dynamic equilibrium