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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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....
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Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Somatosensory, Motor, and Association Cortex01:24

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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...
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Direct Motor Pathways01:11

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and...
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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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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...
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Somatosensation01:33

Somatosensation

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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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Author Spotlight: Assessing Brain Activity in Robotic-Assisted Lower Limb Rehabilitation Using fNIRS
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A posture subspace in primary motor cortex.

Patrick J Marino1,2, Lindsay Bahureksa2,3, Carmen Fernández Fisac2,3

  • 1Dept. of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA.

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Summary
This summary is machine-generated.

The brain

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • The brain integrates movement goals and body posture for action generation.
  • The motor cortex (M1) is crucial for combining these distinct information streams.
  • Understanding M1's organization is key to explaining flexible movement control.

Purpose of the Study:

  • To investigate how posture and movement goal information are organized within M1 neural activity.
  • To determine the relationship between posture representation and movement commands in M1.
  • To elucidate the neural mechanisms underlying flexible motor control in M1.

Main Methods:

  • Recorded neural activity from the motor cortex (M1) in monkeys.
  • Monkeys performed various tasks involving forearm movements across different postures.
  • Analyzed neural population activity to identify posture- and goal-related components.

Main Results:

  • Posture and goal information were found in separable, nearly orthogonal subspaces within M1.
  • The representation of posture in M1 remained stable across different tasks.
  • Neural trajectories for specific movement goals exhibited similar shapes regardless of the body posture.

Conclusions:

  • M1 exhibits a simpler organization of posture information than previously understood.
  • Compartmentalization of posture and goal information in M1 allows for flexible combination.
  • This organization supports the generation of a wide range of actions by the brain.