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The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
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Cerebellar Regional Dissection for Molecular Analysis
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Cerebellum.

Stefan Jun Groiss1, Yoshikazu Ugawa

  • 1Center for Movement Disorders and Neuromodulation, Department of Neurology & Institute of Clinical Neuroscience and Medical Psychology, Heinrich-Heine-University, Düsseldorf, Germany.

Handbook of Clinical Neurology
|October 12, 2013
PubMed
Summary
This summary is machine-generated.

Investigating cerebellar influence on motor cortex excitability using transcranial magnetic stimulation (TMS) reveals its diagnostic potential in clinical neurophysiology for motor control disorders.

Keywords:
TESTMSataxiaataxic hemiparesiscerebellar TMScerebellar facilitationcerebellar inhibitioncerebellar stimulationtranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Clinical Neurophysiology

Background:

  • The cerebellum is crucial for motor control, modulating the primary motor cortex (M1) via cerebellothalamocortical pathways.
  • Noninvasive brain stimulation techniques like transcranial electrical and magnetic stimulation (TMS) are vital for studying neural networks in humans.
  • Motor evoked potentials (MEPs) from single-pulse TMS of M1 quantify motor cortical excitability.

Purpose of the Study:

  • To describe a method for studying cerebellar regulatory effects on the primary motor cortex (M1).
  • To highlight the utility of this cerebellar stimulation method as a diagnostic tool in clinical neurophysiology.

Main Methods:

  • Utilizing a conditioning stimulus over the cerebellum prior to a test stimulus on the contralateral M1.
  • Measuring motor evoked potentials (MEPs) to assess changes in motor cortical excitability.
  • Employing single-pulse transcranial magnetic stimulation (TMS) of M1.

Main Results:

  • The described method allows for the investigation of cerebellar influences on M1 excitability.
  • Cerebellar stimulation preceding M1 stimulation can reveal regulatory effects.

Conclusions:

  • This cerebellar stimulation technique provides a valuable diagnostic tool in clinical neurophysiology.
  • Understanding cerebellar modulation of M1 is key for diagnosing and potentially treating motor control disorders.