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  2. Olfactory receptor - Wikipedia

    en.wikipedia.org/wiki/Olfactory_receptor

    Olfactory receptors (ORs), also known as odorant receptors, are chemoreceptors expressed in the cell membranes of olfactory receptor neurons and are responsible for the detection of odorants (for example, compounds that have an odor) which give rise to the sense of smell.

  3. Sense of smell - Wikipedia

    en.wikipedia.org/wiki/Sense_of_smell

    The sensory receptors of the accessory olfactory system are located in the vomeronasal organ. As in the main olfactory system, the axons of these sensory neurons project from the vomeronasal organ to the accessory olfactory bulb, which in the mouse is located on the dorsal-posterior portion of the main olfactory bulb.

  4. Olfactory bulb - Wikipedia

    en.wikipedia.org/wiki/Olfactory_bulb

    The olfactory bulb transmits smell information from the nose to the brain, and is thus necessary for a proper sense of smell. As a neural circuit, the glomerular layer receives direct input from afferent nerves, made up of the axons from approximately ten million olfactory receptor neurons in the olfactory mucosa, a region of the nasal cavity.

  5. Olfactory system - Wikipedia

    en.wikipedia.org/wiki/Olfactory_system

    The main olfactory system detects airborne substances, while the accessory system senses fluid-phase stimuli. The senses of smell and taste (gustatory system) are often referred to together as the chemosensory system, because they both give the brain information about the chemical composition of objects through a process called transduction.

  6. Olfactory receptor neuron - Wikipedia

    en.wikipedia.org/wiki/Olfactory_receptor_neuron

    The surface of the cilia is covered with olfactory receptors, a type of G protein-coupled receptor. Each olfactory receptor cell expresses only one type of olfactory receptor (OR), but many separate olfactory receptor cells express ORs which bind the same set of odors. The axons of olfactory receptor cells which express the same OR converge to ...

  7. Evolution of olfaction - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_olfaction

    Each receptor type is expressed within a subset of neurons, from which they directly connect to the olfactory bulb in the brain. [1] Olfaction is essential for survival in most vertebrates ; however, the degree to which an animal depends on smell is highly varied. [ 2 ]

  8. Glomerulus (olfaction) - Wikipedia

    en.wikipedia.org/wiki/Glomerulus_(olfaction)

    In the olfactory bulb, the ORNs synapse with termination in the glomeruli. [6] Each glomerulus receives input from olfactory receptor neurons expressing only one type of olfactory receptor. The glomerular activation patterns within the olfactory bulb are thought to represent the quality of the odor being detected.

  9. Sensory nervous system - Wikipedia

    en.wikipedia.org/wiki/Sensory_nervous_system

    Distance chemoreceptors are integral to receiving stimuli in gases in the olfactory system through both olfactory receptor neurons and neurons in the vomeronasal organ. Direct chemoreceptors that detect stimuli in liquids include the taste buds in the gustatory system as well as receptors in the aortic bodies which detect changes in oxygen ...