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Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
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Skeletal Muscle Relaxants: Adverse Effects01:21

Skeletal Muscle Relaxants: Adverse Effects

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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
426
Seizures: Classification01:13

Seizures: Classification

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
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Muscle Contraction01:15

Muscle Contraction

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Related Experiment Video

Updated: Aug 16, 2025

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor

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[Tremor].

Masahito Kobayashi1

  • 1Department of Neurosurgery, Saitama Medical University.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|December 27, 2022
PubMed
Summary
This summary is machine-generated.

This article explains tremors, which are involuntary rhythmic movements. It covers tremor types, causes like Parkinson's disease, and treatment options including surgery.

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MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Area of Science:

  • Neurology
  • Movement Disorders

Context:

  • Tremor is a common neurological symptom characterized by involuntary, rhythmic oscillations.
  • Understanding tremor classification and etiology is crucial for accurate diagnosis and management.

Purpose:

  • To provide a comprehensive overview of tremor classification based on clinical symptoms.
  • To discuss the diverse pathological conditions and etiologies associated with various tremor types.
  • To outline diagnostic approaches and treatment strategies, including surgical interventions for tremors.

Summary:

  • Tremors are classified into rest, postural, kinetic, intention, and task-specific types.
  • Associated conditions include Parkinson's disease, essential tremor, cerebellar tremor, and drug-induced tremors.
  • The article details diagnosis and treatments, encompassing surgical options.

Impact:

  • Enhances understanding of tremor phenomenology and underlying pathologies.
  • Provides a clinical guide for diagnosing and managing patients with tremor.
  • Highlights the role of surgical management in specific tremor cases.