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Related Concept Videos

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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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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves, with the first six being essential in sensory perception, motor control, and autonomic functions related to the head and neck.
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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.
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Olfaction01:25

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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.
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The cranial nerves are an important part of the complex network of nerves in the human body. These nerves emerge directly from the brain and are responsible for transmitting essential information between the brain and various parts of the head and neck. There are 12 pairs of cranial nerves, systematically numbered using Roman numerals from I to XII, beginning from the anterior and moving to the posterior of the brain. Each cranial nerve is uniquely identified by names that reflect its function...
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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves. While the first six innervate the head and neck, the latter six nerves innervate the head and neck, as well as organs and tissues in the thoracic and abdominal cavities. They facilitate communication, expression, and autonomic control within the human body.
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Updated: Jan 4, 2026

Author Spotlight: Exploring Olfactory Influences on Corticospinal Excitability - Insights and Innovations in Neurological Research
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Cranial Nerve Stimulation for Olfaction (Cranial Nerve 1).

Eric H Holbrook1, Daniel H Coelho2

  • 1Department of Otolaryngology Head & Neck Surgery, Massachusetts Eye & Ear, Harvard Medical School, 243 Charles Street, Boston, MA 02114, USA.

Otolaryngologic Clinics of North America
|November 6, 2019
PubMed
Summary

The sense of smell is organized in the olfactory bulb, allowing for potential electrical stimulation. Ongoing research aims to develop olfactory implants for smell restoration.

Keywords:
ElectrodeImplantOlfactory bulbRestorationSmell

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Area of Science:

  • Neuroscience
  • Sensory Systems Biology
  • Bioengineering

Background:

  • The sense of smell relies on olfactory receptor neurons with unique odorant receptors.
  • These neurons converge onto glomeruli in the olfactory bulb, forming a sensory map.
  • This organized structure suggests potential for artificial stimulation.

Purpose of the Study:

  • To explore the feasibility of electrical stimulation for restoring the sense of smell.
  • To highlight the potential of olfactory implants based on the olfactory system's organization.

Main Methods:

  • Review of prior animal and human studies on olfactory stimulation.
  • Analysis of the olfactory system's structural organization.

Main Results:

  • The olfactory system exhibits a defined organizational structure in the olfactory bulb.
  • This structure supports the concept of targeted electrical stimulation.
  • Previous research indicates the feasibility of olfactory stimulation devices.

Conclusions:

  • The inherent organization of the olfactory system provides a basis for developing smell restoration technologies.
  • Olfactory implants represent a promising avenue for addressing smell dysfunction.