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Related Concept Videos

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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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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Cerebellum: Anatomical Regions01:17

Cerebellum: Anatomical Regions

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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
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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...
2.1K
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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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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Related Experiment Video

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Cerebellar Regional Dissection for Molecular Analysis
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Disynaptic cerebrocerebellar pathways originating from multiple functionally distinct cortical areas.

Julia U Henschke1,2, Janelle Mp Pakan1,2,3

  • 1Institute of Cognitive Neurology and Dementia Research, Otto-von-Guericke-University, Magdeburg, Germany.

Elife
|August 16, 2020
PubMed
Summary

This study maps brain connections between the cerebral cortex and cerebellum. Researchers discovered specific pathways, revealing how different cortical areas influence cerebellar function and identifying potential integration hubs.

Keywords:
anterogradecerebellumcerebral cortexmousemultimodalneurosciencesensorimotortans-synaptic tracer

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Area of Science:

  • Neuroscience
  • Cerebrocerebellar circuitry
  • Sensorimotor processing

Background:

  • The cerebral cortex and cerebellum are crucial for sensorimotor control.
  • Precise anatomical connections between these structures are not fully understood.

Purpose of the Study:

  • To elucidate cerebrocerebellar pathways originating from distinct cortical areas.
  • To map the topographical organization of these projections.
  • To identify potential cerebellar regions integrating cortical information.

Main Methods:

  • Anterograde mono-trans-synaptic tracing in mice.
  • Tracing projections from primary motor, sensory, and association cortices.
  • Analysis of corticopontine and extra-pontine cerebrocerebellar pathways.

Main Results:

  • Confirmed organized corticopontine topography, with no projections from primary auditory cortex.
  • Identified numerous extra-pontine cerebrocerebellar pathways targeting cerebellar hemispheres and other lobules.
  • Observed less laterality in association cortex projections compared to primary cortices.
  • Found spatial overlap of projections from distinct cortical areas in specific cerebellar modules (crus I, paraflocculus, vermal regions IV/V and VI).

Conclusions:

  • Cerebrocerebellar pathways are highly organized but diverse.
  • Specific cerebellar regions act as hubs for integrating multimodal cortical input.
  • These findings advance our understanding of sensorimotor integration and cortical-cerebellar communication.