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Overview of Somatic Sensory Pathways

Overview of Somatic Sensory Pathways

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.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...

Major Somatic Sensory Pathways

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

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.

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...

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.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

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Related Experiment Video

Updated: May 22, 2026

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits

Published on: December 27, 2013

Patterning of pre-thalamic somatosensory pathways.

Gabrielle Pouchelon¹, Laura Frangeul, Filippo M Rijli

¹Department of Basic Neurosciences and Clinic of Neurology, University of Geneva, Centre Medico-Universitaire, 1 rue Michel-Servet, CH 1211 Geneva 4, Switzerland.

The European Journal of Neuroscience

|May 22, 2012

Summary

Scientists are exploring the molecular mechanisms behind facial sensory pathway development. Understanding how the brain maps touch input is key to deciphering neural circuit assembly and function.

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Last Updated: May 22, 2026

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits

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Published on: December 27, 2013

Cross-Modal Multivariate Pattern Analysis

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Published on: November 9, 2011

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

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Published on: January 29, 2014

Area of Science:

Neuroscience
Developmental Biology
Sensory Systems

Background:

Topographical mapping is crucial for sensory pathway organization.
The somatosensory system precisely maps facial input from the periphery to the brainstem, thalamus, and cortex.
Distinct polysynaptic pathways connect facial mechanoreceptors to neocortical neurons.

Purpose of the Study:

To investigate the poorly understood molecular mechanisms governing the neuron-type-specific assembly of facial sensory pathways during development.
To leverage advanced genetic tools for cellular-resolution manipulation of developing neural circuits.

Main Methods:

Utilizing genetic tools for precise manipulation of developing neural circuits.
Investigating cellular-resolution mechanisms in somatosensory pathway development.

Main Results:

Recent expansion in knowledge of distinct polysynaptic pathways linking facial mechanoreceptors to neocortical neurons.
Emerging insights into molecular control of neuron-type-specific circuit assembly.

Conclusions:

Advances in genetic tools offer new perspectives on molecular mechanisms of sensory pathway development.
Understanding these mechanisms is vital for comprehending how peripheral input is converted into patterned central pathways.