Flashcards
the auditory system
Flashcards do conjunto (26)
- 1what is sound?vibrations, pressure waves, auditory perception
- 24 major features of soundwaveforms, phase, amplitude (loudness) and frequency (pitch, Hz)
- 3the outer earhas the pinna, concha, auditory meatus (ear canal)
- boosts pressure 30-100 freq - 4concha and pinna functioningsfilter different sound frequencies, cues elevations of sound source
- 5what is tonotopyfrequency along the cochlear; sends info of sound to the brain
- 6what are the 3 smallest bones in the middle?malleus, incus and stapes
- 7how are the middle and outer ears relative to the cochlea?outer and mid ear gathers, and transmit sound waves to the cochlear.
- 8scala vestibulicontians liquid
- 9basilar membraneinner hair cells (cochlear)
- function; perceiving diff sounds in high/low frequencies - 10what part of the basilar membrane is the frequency tuned for low freq?the APEX (end of membrane)
- 11What is the base of the basilar membrane do?tuned for higher frequncies ie. bass in music
- 12what is the auditory function of the ears?collect sound energy ( sound waves) and transfer them into electrical signals for the brain to identify what the source of sound is.
- 13how are sound waves converted into the brain? (hint: in the cochlear)sound waves are transmitted along the the stereocilia via electrical signals to the auditory nerve fibres.
- 14what are the inner hair cells called?stereocilia
- 15where does the earliest stage of central processing occur?at the cochlear nucleus ==> goes into auditory processing (ie. basilar membrane frequncy)
- 16superior olivary (1st area)modulates how much the basilar membrane can move (ie. vibration of surrounidng areas)
- 17inferior colliculusin the mdbrain
- integrates sound info and motor system.
identifies the source of sound.. - 18what does 'tuned' meanhow the neuron respond most intensely at a specific frequency
- 19how do stereocilia movei n the basilar membrane?by a surrounding fluid (perilymph and endolymph) when the inner ear vibrates.
- 20what purpose do hair cells serve?hair cells detect the different frequency of sound in the basilar membrane. they act as sensory receptors.
- 21how do hair cells detect frequency?tactorial membrane vibrates > mech gated K+ channels OPEN > K+ IN hair cells (from K rich endolymph in the stria vascularis) --> CA+ IN > depolarisation => NTs release > sent to brain.
- 22there are 2 kinds of hair cells1 row of inner HC; sensory receptors to brain
3 rows of outer HC; effect axons from cells in the superior olivary complex. - 23cochlear implantscomputed devices that amplify sound for the wearer.
- 24what is the pathway of the major auditory system?A1 cortex (superior olivary compex) => medial geniculate > inferior colliculus > nucleus of lateral lemniscus > superior olive > cochlear nuclei
- 25what is the purpose of the A1 cortex?same as the asbilar membrane but inside the brain.
- 26secondary A1limited reserach about it as it is difficult to 'see' it due to ear canals and fluid.
Informações
- Descrição
- eerrtr FCs: COGS100 QUIZ 2 FlashCards sobre the auditory system, criado por Alice Nugu em 24-05-2016.
- Criado por
- Alice Nugu · mai 2016
- Atualizado
- 22 jun 2016
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