Deafness
The part of the ear that is affected most by deafness
Inner Ear
Inner hair cells are _____ meaning they send information TO the brain
afferent
Where higher frequencies are localized
The base of the cochlea
Basic definition
The delay between both ears called interaural time difference
Three parts of the ear
Inner, Middle, Outer
Problems with hearing high or low pitched sounds
Frequency Deafness
The Inner Hair Cells are the first to...
Fire an action potential
Where lower frequencies are localized
The apex of the cochlea
Process of Interaural time delay
Sound enters the right ear and there is a delay before the sound goes to the left ear
Components of the inner ear
cochlea, semicircular canals, nerves
Deafness that occurs from the impaired transmissions of vibrations to the inner ear
Conduction Deafness
They have significantly more of this than the outer hair cells
Input to the auditory nerve
Structure that the basilar membrane is apart of
Cochlea
There is no interaural time delay
Sound coming from straight ahead
Components of the Middle Ear
malleus, incus, stapes, oval window
Deafness due to death of inner hair cells, may come with aging and exposure to loud sounds
Sensorineural Deafness
Why these hair cells cause deafness
The hair cells cannot regenerate so death of them cause deafness
Significance of Basilar Membrane
Separating incoming sound into its component frequencies that activate different cochlear regions
Why time difference is so important
Tells us where the sound is coming from (how far to the side or behind us)
Components of the outer ear
Pinna, ear canal, tympanic membrane
More specifically, which part of the inner ear is damaged when deafness occurs
Cochlea
Significance of Inner Hair cells
Types of hair cells that make up the basilar membrane
1 row of inner hair cells
3 rows of outer hair cells
The kind of frequency does this work better with
Significance of eustachian tubes
Equalize air pressure between the atmosphere and the middle ear