L17-OlfactionII - • Olfactory system anatomy o Olfactory...

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Olfaction Olfaction o Chemical senses may be the earliest sensory systems to develop o Stimuli for odor (odorants) consist of volatile substances having a molecular weight of approximately 15 to 300. o Almost all odorous compounds are lipid soluble and of organic origin o Individual receptor cells in the nasal epithelium will respond to many dozens of odors Elements of Olfactory Processing (350-1000 different olfactory receptors) o Odor o Receptor Neuron: particular receptor protein for particular odors fires an action potential o Olfactory Bulb: receptor projects to glomerulus and to mitral/tufted cell and thenprojects to the olfactory cortex in the brain
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Unformatted text preview: • Olfactory system anatomy o Olfactory epithelium lines the nasal cavity, where receptor neurons are o Olfactory receptors send action potentials to olfactory bulb right above the eyes through the Cribriform Plate • More specific anatomy on lecture slides • Taste o Five tastes: Sweet, salty, bitty, sour, “Umami” o No evidence for spatially segregated organization of taste on the tongue o Information goes from Tongue and Larynx up 7 th , 9 th , and 10 th cranial nerve to the nucleus of the solitary tract, and into the ventral posterior medial nucleus of the thalamus, where it goes into the gustatory cortex....
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