Friday February 20 2015 Somatosensory System Info skin muscles bones tendons joints Provides information from the skin Gathers info from all of the above o How much they are working what their temp is etc Type free or modified afferent terminals o This set up provides us with the most speed Components o Thermo and mechanorecptors We get info on temp and pressure We don t need the details we just need to know the info as fast as possible in case tissue is being burned rippied o Nociceptors detect products of damaged and immune cells They pick up on signal from immune cells fighting pathogens That is why all your muscles and joints ache because the nociceptors are being activated by the huge amount of immune system communication going on Spatially related positioning in brain o Figure 7 20 o Huh o Cortical projection Aka homunculus We have more afferent cells in our hands o We can make changes but they are limited huh Auditory System Info sound wave Type stereocilia o Figure 7 41 o Mechanoreceptors o Stereocilia Aka cochlear hair cells Components o Figure 7 37 o Path for sound o External auditory canal o Tympanic membrane o Middle ear air o Cochlea water aka inner ear Structure that looks like a snail o Auditory nerve o CNS Cochela encodes wave o Mechanical bending of stereocilia the hair cells bend K and Ca key in process Need to learn details of this process Mechanically gated channels and voltage gated channels Friday February 20 2015 o What s coded Amplitude loudness Whisper vs rock concert Measured by the amount of bend of your stereocilia Frequency pitch Deep voice vs high pitch voice mickey mouse Determines which specific steriocillia are bent o High frequencies hit sooner than the low frequency High near base of cochlea Low near apex of cochlea This sets up the limit of our hearing range o As we age the high pitch starts to wear out the hair cells so we can t hear the high pitch as much any more o What s missing Location in space of source Ally speaks up in the middle of the room and we can identify where she is in the room Two detections allow for cerebral geometry o
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