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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Parallel Processing01:20

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Sensory Perception: Organization of the Somatosensory System01:11

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
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Overview of Somatic Sensory Pathways01:29

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Parallel processing of afferent olfactory sensory information.

Christopher E Vaaga1,2, Gary L Westbrook1

  • 1Vollum Institute.

The Journal of Physiology
|July 6, 2016
PubMed
Summary
This summary is machine-generated.

Olfactory receptor neurons directly activate mitral cells in the olfactory bulb via monosynaptic input. This direct pathway amplifies sensory information, contrasting with the transient responses of external tufted cells.

Keywords:
external tufted cellsmitral cellsolfactory bulbolfactory receptor neuronssynaptic transmission

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Area of Science:

  • Neuroscience
  • Olfaction
  • Synaptic Plasticity

Background:

  • Olfactory receptor neurons (ORNs) form synaptic connections within olfactory bulb glomeruli.
  • The precise functional connectivity between ORNs and principal cells (mitral and external tufted cells) is debated.
  • A prevailing view suggests ORN input to mitral cells is primarily indirect via feedforward excitation.

Purpose of the Study:

  • To investigate the direct synaptic connectivity between ORNs and mitral cells.
  • To compare the postsynaptic responses of mitral cells and external tufted cells to ORN input.
  • To elucidate the mechanisms of sensory information processing in the olfactory bulb.

Main Methods:

  • Focal stimulation of single olfactory bulb glomeruli.
  • Electrophysiological recordings of evoked postsynaptic currents (EPSCs) in mitral and external tufted cells.
  • Analysis of EPSC amplitude, charge, and kinetics.

Main Results:

  • Mitral cells receive direct, monosynaptic input from ORNs.
  • Mitral cells exhibit a prolonged EPSC, leading to greater synaptic charge compared to external tufted cells.
  • Presynaptic release properties from ORNs are similar for both cell types, suggesting differences in synaptic contacts account for varied EPSC amplitudes.

Conclusions:

  • ORNs provide parallel input pathways to the olfactory bulb.
  • Mitral cells amplify sensory input through prolonged integration of direct ORN excitation.
  • These parallel pathways may support distinct roles in olfactory processing.