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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

Muscle Contraction01:10

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Tension01:10

Tension

Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a direction parallel to...
Tension01:10

Tension

Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a direction parallel to...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...

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Related Experiment Video

Updated: Jul 14, 2026

Metacarpal Small Incision for Carpal Tunnel Syndrome
04:08

Metacarpal Small Incision for Carpal Tunnel Syndrome

Published on: April 5, 2024

[Writer's cramp].

Nagako Murase1

  • 1Department of Neurology, National Hospital Organization Utano National Hospital, 8 Ondoyama-cho, Narutaki, Ukyo ku, Kyoto 616 8255, Japan.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|June 26, 2007
PubMed
Summary

Writer's cramp, a focal dystonia, involves abnormal sensory-motor integration and loss of inhibition. Understanding its pathophysiology and reducing writing are key first steps, with treatments like lidocaine blocks or medication used based on severity.

Area of Science:

  • Neurology
  • Movement Disorders
  • Neuroscience

Context:

  • Writer's cramp is a focal dystonia characterized by abnormal sensory-motor integration.
  • Pathophysiology involves loss of inhibition at multiple nervous system levels (cortex, spinal cord, peripheral nerves).
  • Altered basal ganglia firing patterns and motor loop dynamics are implicated.

Purpose:

  • To elucidate the pathophysiology of writer's cramp.
  • To outline initial therapeutic strategies for focal dystonia.

Summary:

  • Abnormal sensory-motor integration and widespread loss of inhibition characterize writer's cramp.
  • Altered basal ganglia activity and motor loop function are likely contributors.
  • Initial management includes patient education on pathophysiology and reducing writing demands.

Related Experiment Videos

Last Updated: Jul 14, 2026

Metacarpal Small Incision for Carpal Tunnel Syndrome
04:08

Metacarpal Small Incision for Carpal Tunnel Syndrome

Published on: April 5, 2024

Impact:

  • Provides foundational understanding for managing writer's cramp.
  • Informs initial patient counseling and activity modification strategies.
  • Highlights potential therapeutic targets for focal dystonia treatment.