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Related Concept Videos

Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
Layers of Connective Tissue Proper01:21

Layers of Connective Tissue Proper

Fascia, a thin layer of fibrous connective tissue, is distributed throughout the body. It demarcates and forms a supportive covering over skeletal muscles, bones, blood vessels, and organs. There are three main types of facia— superficial fascia, deep fascia, and subserous fascia. These are all present at different depths in the body. Fascia reduces the friction and permits muscles, joints, and organs to easily slide against each other, facilitating movement of the body and preventing tearing...
Somatic Spinal Reflexes01:22

Somatic Spinal Reflexes

Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
Alterations in Muscle Tone lll01:11

Alterations 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...
Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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Related Experiment Video

Updated: Jun 2, 2026

Fu's Subcutaneous Needling for Knee Osteoarthritis Pain
07:19

Fu's Subcutaneous Needling for Knee Osteoarthritis Pain

Published on: March 24, 2023

Latent myofascial trigger points.

Hong-You Ge1, Lars Arendt-Nielsen

  • 1Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajersvej 7-D3, Aalborg 9220, Denmark. ghy@hst.aau.dk

Current Pain and Headache Reports
|May 12, 2011
PubMed
Summary
This summary is machine-generated.

Latent myofascial trigger points (MTPs) involve muscle hyperirritability causing pain and dysfunction. Addressing MTPs can reduce pain, improve motor function, and prevent myofascial pain syndrome development.

Related Experiment Videos

Last Updated: Jun 2, 2026

Fu's Subcutaneous Needling for Knee Osteoarthritis Pain
07:19

Fu's Subcutaneous Needling for Knee Osteoarthritis Pain

Published on: March 24, 2023

Area of Science:

  • Physiology
  • Pain Medicine
  • Neurology

Background:

  • Latent myofascial trigger points (MTPs) are hyperirritable foci in muscle taut bands.
  • MTPs are associated with local twitch responses, tenderness, and referred pain.
  • Spontaneous electrical activity at MTPs resembles muscle contraction potentials, contributing to pain and dysfunction.

Purpose of the Study:

  • To review mechanisms of sensory-motor dysfunctions linked to latent MTPs.
  • To discuss the role of central sensitization in MTP-related pain and motor issues.
  • To explore how MTP networks contribute to pain propagation.

Main Methods:

  • Literature review of current evidence on MTPs.
  • Analysis of the temporal profile of MTP electrical activity.
  • Discussion of central sensitization and MTP network contributions.

Main Results:

  • Latent MTPs contribute to local tenderness, pain, and motor dysfunctions.
  • Central sensitization amplifies pain and motor deficits associated with MTPs.
  • MTP networks can facilitate the spatial spread of pain and dysfunction.

Conclusions:

  • Treating latent MTPs may decrease pain sensitivity and improve motor function.
  • Intervention for latent MTPs can prevent progression to active MTPs.
  • Preventing MTP transformation may avert myofascial pain syndrome development.