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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Association Areas of the Cortex01:21

Association Areas of the Cortex

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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Overview of Somatic Sensory Pathways01:29

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...
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Major Somatic Sensory Pathways01:28

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...

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Related Experiment Video

Updated: May 28, 2026

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
09:52

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Published on: February 23, 2020

Long-range neuronal circuits underlying the interaction between sensory and motor cortex.

Tianyi Mao1, Deniz Kusefoglu, Bryan M Hooks

  • 1Janelia Farm Research Campus, HHMI, 19700 Helix Drive, Ashburn, VA 20147, USA.

Neuron
|October 11, 2011
PubMed
Summary

Researchers mapped connections between the barrel cortex and motor cortex in mice. Barrel cortex strongly influences superficial motor cortex neurons, suggesting a role in sensorimotor integration and learning.

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Area of Science:

  • Neuroscience
  • Sensory Systems

Background:

  • The rodent vibrissal system relies on barrel cortex and vibrissal motor cortex interactions.
  • Neural circuit mechanisms underlying sensorimotor integration remain largely uncharacterized.

Purpose of the Study:

  • To map neuronal connections between the barrel cortex and pyramidal neurons in the mouse motor cortex.
  • To elucidate the role of these connections in sensorimotor integration.

Main Methods:

  • Utilized Channelrhodopsin-2 (ChR2) expression for targeted neuronal activation.
  • Employed anterograde and retrograde labeling techniques to trace neural pathways.
  • Investigated connections at the laminar and dendritic domain levels within the motor cortex.

Main Results:

  • Barrel cortex axons preferentially innervated superficial motor cortex layers (L2/3, L5A).
  • Input was particularly strong to neurons projecting back to the barrel cortex.
  • Deeper motor cortex layers (L5B, L6), including brainstem-projecting neurons, received weak barrel cortex input despite dendritic overlap.

Conclusions:

  • Superficial layer cortico-cortical neurons in the motor cortex are key integrators of sensory and motor signals.
  • These circuits likely mediate sensorimotor integration and motor learning processes.
  • Laminar-specific connectivity patterns shape information flow between sensory and motor cortices.