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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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Overview of Somatic Sensory Pathways01:29

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.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Direct Motor Pathways01:11

Direct Motor Pathways

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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

2.1K
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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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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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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Indirect Motor Pathways01:22

Indirect Motor Pathways

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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.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Related Experiment Videos

Switching between cortical and subcortical sensorimotor pathways.

Tadashi Isa1, Yasushi Kobayashi

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki 444-8585, Japan. tisa@nips.ac.jp

Progress in Brain Research
|December 5, 2003
PubMed
Summary
This summary is machine-generated.

Express saccades utilize a rapid brainstem pathway, while regular saccades use a cortical pathway. The superior colliculus acts as a gate, controlling signal flow between these visually guided saccade systems.

Related Experiment Videos

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Visually guided saccades show bimodal reaction time distributions.
  • Extremely short reaction times define express saccades, suggesting a direct brainstem pathway.
  • Longer reaction times characterize regular saccades, implicating a cortical pathway.

Purpose of the Study:

  • To elucidate the neural mechanisms underlying the gating of visually guided saccades.
  • To investigate the role of the superior colliculus in switching between express and regular saccade pathways.

Main Methods:

  • Analysis of reaction time distributions in visually guided saccades.
  • Hypothesized neural pathways: short-loop (brainstem) for express saccades and long-loop (cortical) for regular saccades.
  • Proposed gating mechanism within the superior colliculus (SC) layers.

Main Results:

  • Express saccades are mediated by a rapid, brainstem-based 'short-loop' pathway.
  • Regular saccades are proposed to use a 'long-loop' sensorimotor pathway involving cortical structures.
  • The superior colliculus (SC) is identified as the critical 'gate' for pathway selection.
  • Nonlinear amplification in deeper SC layers may facilitate this gating function.

Conclusions:

  • The superior colliculus (SC) plays a crucial role in gating visually guided saccade pathways.
  • Context-dependent regulation by cortical and basal ganglia inputs influences SC gate switching.
  • Understanding this mechanism offers insights into sensorimotor integration and control.