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Related Concept Videos

Olfaction01:25

Olfaction

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...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Related Experiment Video

Updated: Jul 1, 2026

Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
06:32

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

Published on: June 5, 2017

Rat olfactory bulb mitral cells receive sparse glomerular inputs.

Antoniu L Fantana1, Edward R Soucy, Markus Meister

  • 1Molecular and Cellular Biology Department and Center for Brain Science, Harvard University, Cambridge, MA 02138, USA.

Neuron
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Olfactory bulb mitral cells do not have center-surround receptive fields. Instead, they process a small, diverse set of glomerular inputs for specific computations, challenging previous neuroscience models.

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Sensory Processing

Background:

  • Center-surround receptive fields are a key neural circuit model.
  • Olfactory bulb mitral cells were hypothesized to possess this circuitry, with broad inhibition.
  • This proposed structure suggested mitral cells would respond to numerous odors.

Purpose of the Study:

  • To investigate the receptive field properties of olfactory bulb mitral cells.
  • To test the hypothesis that mitral cells exhibit center-surround organization.
  • To determine the number and spatial distribution of glomerular inputs influencing mitral cell activity.

Main Methods:

  • In vivo intrinsic imaging
  • Single-unit electrophysiological recordings
  • Stimulation with a diverse panel of odorants
  • Quantitative computational modeling

Main Results:

  • Mitral cell response rates were significantly lower than predicted by a broad inhibitory field model.
  • Quantitative models indicated mitral cell responses are driven by a small number of glomeruli.
  • These influential glomeruli were spatially dispersed and had varied odor sensitivities.

Conclusions:

  • Olfactory bulb mitral cells do not exhibit center-surround receptive fields.
  • Each mitral cell integrates information from a small, diverse set of glomerular inputs.
  • Mitral cells perform specific computations based on these limited, varied inputs, not broad inhibition.