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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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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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Motor and Sensory Areas of the Cortex01:14

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

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New Methods to Study Gustatory Coding
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Odor coding in piriform cortex: mechanistic insights into distributed coding.

Robin M Blazing1, Kevin M Franks1

  • 1Department of Neurobiology, Duke University Medical School, Durham, NC, 27705, United States.

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|May 19, 2020
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Summary
This summary is machine-generated.

This review explores how the piriform cortex encodes odor identity, intensity, and valence. It proposes a multiplexed code enabling odor recognition and behavior.

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Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
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Area of Science:

  • Neuroscience
  • Olfactory System Research

Background:

  • Olfaction is crucial for animal behaviors like feeding, mating, and communication.
  • Understanding odor perception requires deciphering neural transformations within the olfactory system.

Purpose of the Study:

  • To review coding principles and mechanisms for encoding odor identity, intensity, and valence.
  • To examine the role of the piriform cortex in olfactory processing.

Main Methods:

  • Review of existing literature on olfactory coding.
  • Analysis of neural mechanisms in the piriform cortex and other olfactory areas.

Main Results:

  • The piriform cortex employs a multiplexed odor code.
  • This code allows for non-interfering representations of distinct odor features.

Conclusions:

  • The piriform cortex's multiplexed code facilitates odor recognition and learning.
  • This neural mechanism ultimately drives complex animal behaviors.