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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...

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.

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...

Spinal Cord: Information Processing

Spinal Cord: Information Processing

The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...

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.

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Related Experiment Video

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Combined Peripheral Nerve Stimulation and Controllable Pulse Parameter Transcranial Magnetic Stimulation to Probe Sensorimotor Control and Learning

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Action-based sensory encoding in spinal sensorimotor circuits.

Jens Schouenborg¹

¹Group of Neurophysiology, Neuronanoscience Research Center, Department of Experimental Medical Research, BMC F10, Lund University, S-221 84 Lund, Sweden. Jens.Schouenborg@med.lu.se

Brain Research Reviews

|October 9, 2007

Summary

Spinal cord organization emerges from activity-dependent learning, not innate maps. Somatosensory imprinting during sleep refines sensorimotor circuits for movement correction.

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Area of Science:

Neuroscience
Developmental Biology
Spinal Cord Research

Background:

The spinal cord's modular organization is key to understanding sensorimotor function and movement correction.
Developmental processes shape spinal cord networks, influencing how sensory input is processed.

Purpose of the Study:

To investigate the role of somatosensory imprinting in shaping spinal cord sensorimotor circuits.
To explore how activity-dependent mechanisms contribute to the topographical organization of tactile input in the spinal cord.

Main Methods:

Analysis of learning-dependent mechanisms and network-level body representation.
Examination of tactile input associated with spontaneous sleep movements.
Investigation of synaptic plasticity in the adult dorsal horn.

Main Results:

Somatosensory imprinting, driven by tactile input during sleep, refines spinal cord connections.
The organization of tactile input in the lower lumbar dorsal horn is action-based, not a simple body map.
Adult spinal cord organization arises from activity-dependent rearrangements of synaptic connections, challenging innate mapping theories.

Conclusions:

Somatosensory imprinting is crucial for the self-organization of the spinal cord during development.
Spinal sensorimotor circuits are dynamically shaped by experience, particularly during early development.
The study reframes understanding of spinal cord development from innate structures to experience-driven organization.