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Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

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:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

Introduction to Special Senses

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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.

Chemotaxis and Direction of Cell Migration

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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon towards...

Overview of Somatic Sensory Pathways

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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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The dorsal...

What is a Sensory System?

What is a Sensory System?

Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.

Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Related Experiment Video

Updated: May 25, 2026

Automated Analysis of a Nematode Population-based Chemosensory Preference Assay

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Published on: July 13, 2017

Sensor selection and chemo-sensory optimization: toward an adaptable chemo-sensory system.

Alexander Vergara¹, Eduard Llobet

¹BioCircuits Institute, University of California San Diego La Jolla, CA, USA.

Frontiers in Neuroengineering

|February 10, 2012

Summary

This summary is machine-generated.

Developing adaptable chemical sensors is crucial for health, environment, and security. This review highlights advances in device, data processing, and system strategies for tunable and responsive molecular sensing platforms.

Keywords:

active sensing electronic nose metal-oxide gas sensors sensor optimization sensor-array optimization tunable sensors

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Area of Science:

Materials Science
Micro- and Nanotechnology
Signal Processing
Chemical Sensing
Information Theory

Background:

Current chemical sensors struggle with long-term autonomous operation in real-world samples due to receptor binding and transduction changes.
Existing molecular sensing platforms lack adaptability to environmental variations and evolving application needs.
Despite research in machine olfaction and micro-sensory systems, simple, low-cost, and autonomous platforms remain a challenge.

Purpose of the Study:

To review key advances enabling chemo-sensory systems to adapt to their environments.
To consolidate research on device, data processing, and system-level strategies for adaptable chemical sensing.
To explore strategies providing tunability and adaptability in single sensor devices and sensory array systems.

Main Methods:

Focus on hybrid chemo-sensory systems with tunable operating parameters.
Review of strategies including sensor-array selection and modulation of internal sensing parameters.
Inclusion of active sensing techniques for enhanced molecular detection.

Main Results:

Hybrid systems demonstrate improved adaptability through tunable parameters.
Strategies like sensor-array selection and active sensing enhance system responsiveness.
Advances in materials science, micro/nanotechnology, and signal processing are key enablers.

Conclusions:

Adaptable chemo-sensory systems are achievable through integrated device, data processing, and system-level innovations.
Tunability and adaptability are critical for overcoming limitations in real-world chemical sensing.
Future directions involve further evolution of adaptive strategies for diverse applications.