Hair Cells and Sensory Reception – Hearing (PSY,BIO)

by Tarry Ahuja, MD

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    Now sound waves enter the outer ear causing the eardrum to vibrate. So there is the canal. That sound wave comes in. And part of the design of the canal is to sort of focus and localize that sound information and bring it right to the outer -- sorry, to the eardrum. Now the vibration passes from the malleus to the incus to stapes and it’s, literally, a movement of bones in this solution. And the stapes carries vibrational information to the oval window. At which point, vibrations is in the oval window create pressure waves in the fluid of the cochlea. And that’s where we’re really getting a lot of the activation. So all of these previous steps that I’ve talked about, the job is to take this information coming from the air, literally, sound waves, focus them, have them go through an aqueous solution, that’s the solution in the cochlea, and convert that into vibrational energy. And then we get to the third stage which is converting these pressure waves into actual movement of hair cells. So the basilar membrane is covered by these hair cells which have cilium. And you move the cilia. These structures are found in something called the organ of Corti. And as these little hairs move, it actually opens ion channel. So we say displacement by the wave opens ion channels which leads to neurotransmitter release and then goes on a cause and action potential. So again, sound energy gets converted into wave energy. It gets converted into vibrational energy within the wave into mechanical energy, movement of the hair cells, which gets converted into an action potential. And also included in there is some chemical because of the neurotransmitter. So we’ve gone through this whole slew of stuff. And that’s why I...

    About the Lecture

    The lecture Hair Cells and Sensory Reception – Hearing (PSY,BIO) by Tarry Ahuja, MD is from the course Sensing the Environment.

    Included Quiz Questions

    1. A defect in stereocilia
    2. A defect in the oval window
    3. A defect in the semicircular canal fluid
    4. A defect in the cochlear fluid
    5. A defect in neurotransmitter release
    1. Base of the basilar membrane
    2. Apex of the basilar membrane
    3. Organ of corti
    4. Oval window
    5. Middle ear

    Author of lecture Hair Cells and Sensory Reception – Hearing (PSY,BIO)

     Tarry Ahuja, MD

    Tarry Ahuja, MD

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