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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Role of Hippocampus in Memory01:19

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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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

Olfactory Receptors: Location and Structure

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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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Functional Brain Systems: Limbic System01:15

Functional Brain Systems: Limbic System

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Related Experiment Video

Updated: Dec 29, 2025

A Video Demonstration of Preserved Piloting by Scent Tracking but Impaired Dead Reckoning After Fimbria-Fornix Lesions in the Rat
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A Video Demonstration of Preserved Piloting by Scent Tracking but Impaired Dead Reckoning After Fimbria-Fornix Lesions in the Rat

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Fimbria-Fornix Volume Is Associated With Spatial Memory and Olfactory Identification in Humans.

Louisa Dahmani1, Blandine Courcot2, Jamie Near2

  • 1Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada.

Frontiers in Systems Neuroscience
|February 4, 2020
PubMed
Summary
This summary is machine-generated.

The volume of the right fimbria-fornix is linked to spatial memory and smell identification in individuals using hippocampus-based strategies. This highlights shared neural pathways for these cognitive functions.

Keywords:
fimbria-fornixhippocampusnavigationolfactionspatial memorywhite matter

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Last Updated: Dec 29, 2025

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Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroanatomy

Background:

  • The hippocampus plays a key role in spatial memory and olfactory identification.
  • White matter pathways surrounding the hippocampus are critical for its function.
  • Previous research suggests a link between spatial memory and olfaction.

Purpose of the Study:

  • To investigate the relationship between the fimbria-fornix white matter bundle and spatial memory and olfactory identification.
  • To determine if this relationship differs based on navigation strategy (hippocampus-based vs. caudate nucleus-based).

Main Methods:

  • A virtual navigation task and an olfactory identification task were administered to 55 healthy young adults.
  • The volume of the fimbria-fornix white matter bundle was measured.
  • Participants were categorized based on their spatial navigation strategy.

Main Results:

  • The volume of the right fimbria-fornix and its subdivisions correlated with navigational learning and olfactory identification.
  • This correlation was significant only in participants using hippocampus-based spatial memory strategies.
  • No significant correlation was found in participants using caudate nucleus-based navigation strategies.

Conclusions:

  • The fimbria-fornix is important for spatial memory and olfactory identification, particularly when using hippocampus-dependent strategies.
  • These findings support the idea that spatial memory and olfaction share overlapping neural networks.
  • The study underscores the interconnectedness of different cognitive functions mediated by specific white matter tracts.