Smell (Olfaction) – Other Senses (PSY, BIO)

by Tarry Ahuja, MD

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    Now, next sent -- sorry, next sense which would be scent is smell. So how do you smell things? And we call that the process of olfaction. So this one’s also quite unique and then it employs, again, detection of a chemical stimulus. So the olfactory receptors are found on the roof of the nasal cavity or the nasopharynx. And there is something called the mucus membrane there. So the mucus membrane like the name kind of applies. Mucus is we all know of kind of phlegmy or sticky. And the membrane is a body where things would stick. So as we breathe smells in, the chemical is actually end up sticking to the mucus membrane that’s found in the nasal cavity, and that allows the molecules to actually interact with the receptors that are found there. So olfactory nerves project directly from the olfactory bulbs of the brain in the temporal lobe. So it’s a direct connection. So very, very fast and it’s very, very hands on. There’s this limbic system in this area within the temporal lobe is an area that also deals with memory and emotion, which is why we tend to make that correlation between smells and memories and emotions. Now you go to your local fancy-pancy shop with your wife or girlfriend and they have all these different scented candles and they have different names like calming and romance and you know and basically what they’re doing is they’re linking that scent to emotions that most of us have. Now you can think of certain smells that evoke the smell and memories associated with, say, Christmas or maybe the beach or summertime. All of these different relationships are done in this area, the temporal lobe. So another really neat thing that happens is this paring...

    About the Lecture

    The lecture Smell (Olfaction) – Other Senses (PSY, BIO) by Tarry Ahuja, MD is from the course Sensing the Environment.

    Included Quiz Questions

    1. Roof of the nasopharynx
    2. Lateral wall of the nasopharynx
    3. Posterior aspect of the nasopharynx
    4. Torus tubarius of the nasopharynx
    5. Anterior aspect of the nasopharynx
    1. Taste
    2. Smell
    3. Sight
    4. Hearing
    5. Touch
    1. ...olfactory nerves relay signals to ganglions before synapsing in temporal lobe.
    2. ...is involved in perception of targeted chemical signals to cause a social response in a species.
    3. ...is connected with the limbic system.
    4. ...is linked to memory and emotion.
    5. ...olfactory receptors are located in the nasopharynx.

    Author of lecture Smell (Olfaction) – Other Senses (PSY, BIO)

     Tarry Ahuja, MD

    Tarry Ahuja, MD

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