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Related Concept Videos

Fixed Action Patterns01:06

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
Projectile Motion: Example01:18

Projectile Motion: Example

The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on level...
Muscles of the Forearm that Move the Hand and Fingers01:16

Muscles of the Forearm that Move the Hand and Fingers

The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Reflex Activity01:08

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...
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...
Tetanus01:29

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...

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Related Experiment Video

Updated: Jun 20, 2026

A Tactile Automated Passive-Finger Stimulator (TAPS)
19:44

A Tactile Automated Passive-Finger Stimulator (TAPS)

Published on: June 3, 2009

Trigger Finger? Just Shoot!

Stephen P Merry1, Jason S O'Grady1, Christopher L Boswell1

  • 1Mayo Clinic, Rochester, MN, USA.

Journal of Primary Care & Community Health
|July 21, 2020
PubMed
Summary
This summary is machine-generated.

Corticosteroid injections offer a safe and effective treatment for trigger finger, a common condition caused by A1 pulley stenosis. This method provides rapid symptom relief, making it a preferred option over surgery for most patients.

Keywords:
corticosteroid injectionstenosing flexor tenosynovitisstenosing tenosynovitissteroid injectiontrigger fingertrigger thumb

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Related Experiment Videos

Last Updated: Jun 20, 2026

A Tactile Automated Passive-Finger Stimulator (TAPS)
19:44

A Tactile Automated Passive-Finger Stimulator (TAPS)

Published on: June 3, 2009

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)
04:40

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)

Published on: July 30, 2020

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles
09:27

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

Published on: August 25, 2020

Area of Science:

  • Orthopedics
  • Hand Surgery
  • Musculoskeletal Disorders

Background:

  • Trigger finger, or stenosing tenosynovitis, is a prevalent condition affecting the hand.
  • It stems from A1 pulley stenosis, leading to tendon friction, nodularity, pain, and functional impairment (catching/locking).

Purpose of the Study:

  • To present a detailed, illustrated guide for corticosteroid injections to treat trigger finger.
  • To encourage primary care providers to adopt this minimally invasive and effective treatment modality.

Main Methods:

  • A step-by-step procedural guide for corticosteroid injection at the A1 pulley is detailed.
  • Illustrations accompany the method description to aid understanding and execution.

Main Results:

  • Corticosteroid injections provide rapid symptom resolution, typically within days for pain and weeks for catching/locking.
  • Splinting is an alternative, offering gradual improvement over 6-9 weeks.

Conclusions:

  • Corticosteroid injection is a safe, simple, and highly effective first-line treatment for trigger finger.
  • Surgical release is best reserved for cases refractory to injection, especially in high-risk populations like diabetics.