Related Experiment Video
Updated: Aug 7, 2026
10:00
Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle
Published on: November 17, 2010
Pathophysiology of writer's cramp
1Human Motor Control Section, NINDS, NIH Building 10, Room 5N226 Bethesda, MD 20892-1428, USA. hallettm@ninds.nih.gov
Human Movement Science
|July 25, 2006
Summary
Writer's cramp, a task-specific focal hand dystonia, may be triggered by extensive writing in genetically predisposed individuals. Understanding its pathophysiology, possibly involving reduced inhibition or altered plasticity, is key to developing new therapies.
Area of Science:
- Neurology
- Movement Disorders
- Neuroscience
Background:
- Writer's cramp is a focal hand dystonia characterized by task specificity.
- The condition highlights the intricate relationship between motor programs and effector control.
- A genetic predisposition, potentially involving reduced inhibition, increased plasticity, or sensory impairments, is suspected.
Purpose of the Study:
- To explore the underlying mechanisms of writer's cramp.
- To understand the task-specific nature of focal hand dystonia.
- To identify potential therapeutic targets based on pathophysiological findings.
Main Methods:
- Review of existing literature on writer's cramp.
- Analysis of task specificity in focal dystonia.
- Correlation of genetic and physiological factors with disorder development.
Main Results:
- Writer's cramp is strongly linked to prolonged writing activities.
- Task specificity suggests a complex interplay between learned motor patterns and neural control.
- Potential contributing factors include decreased neural inhibition, heightened neural plasticity, and altered sensory processing.
Conclusions:
- Writer's cramp pathophysiology is multifactorial, involving genetic predisposition and environmental triggers.
- Further research into neural inhibition, plasticity, and sensory function is warranted.
- Emerging pathophysiological insights offer promise for novel therapeutic interventions for writer's cramp.
Related Concept Videos
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:11Alterations in Muscle Tone lll
Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
01:10Muscle 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...
01:15Muscle Contraction
01:22Myasthenia Gravis ll: Pathophysiology
The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...