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Thread: Vomeronasal Chemoreception in Vertebrates

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    Thumbs up Vomeronasal Chemoreception in Vertebrates

    Vomeronasal Chemoreception in Vertebrates
    A Study of the Second Nose
    by Charles Evans




    Pages: 290
    Publisher: --
    Edition: 1st., 2003
    Language: English
    ISBN: 978-1860942695

    Description

    Thanks to the keen eyes of a Danish military surgeon, and the burning of some late-night oil, the world of comparative anatomy came to know of the existence of the vomeronasal organ (VNO), sometimes known as Jacobson's organ, after its discoverer Ludwig Levin Jacobson. Despite almost two centuries of advancement of anatomical knowledge, rather
    little is known about the organ, even to this day. The eponymouslynamed organ was thought by Jacobson to be secretory in function but this is now known not to be the case. Its location, in the nasal cavity at the base of the nasal septum where that piece of cartilage joins the vomer bone, suggests it has something to do with the nose and the sense of smell. And so it has. The organ certainly does process molecules plucked from the outside world but the transmission of the information gleaned enters the brain not via the olfactory bulb, but via a small structure closely appressed to the olfactory bulb, and known as the accessory olfactory bulb. Vomeronasal nerves thus run directly
    to the evolutionarily ancient smell-brain, or rhinencephalon, via their own pathways. If the sense of smell is, by definition, mediated by the nose and nasal mucosa capable of sensing compounds of high volatility, then the VNO is not part of the sense of smell. But it is part of the wider chemical sensory systems found in the air-breathing
    vertebrates.

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