Wrist Extension
Wrist Extension - Related Videos
12:21
Wrist and Hand Examination
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2015
Source: Robert E. Sallis, MD. Kaiser Permanente, Fontana, California, USA The wrist is a complex joint made up of 8 carpal bones and their numerous articulations and ligaments. Overlying the wrist are the tendons and muscles of the hand and fingers. The hand is made up of 5 metacarpal bones, and the tendons that run to the hand overlie these bones. Finally, the fingers consist of 14 phalanges with their articulations held together by collateral ligaments and volar plates. Common mechanisms of...
03:32
Using a Macrophage Conditioned Medium to Promote Neuron Extensions
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2025
This video demonstrates an assay for promoting the growth of neuron projections known as neurite outgrowth using the macrophage-conditioned medium. Co-culture neurons and macrophages with cAMP and harvest the macrophage-derived conditioned medium. Growing the neurons with the conditioned medium promotes neurite outgrowths. These outgrowths are fluorescently labeled and visualized using a fluorescence microscope.
28:40
Proboscis Extension Response (PER) Assay in Drosophila
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Cited by 114 •
2007
Proboscis extension response or PER is a taste behavior assay that has been used in flies as well as in honeybees. When the proboscis makes contact with an attractive substance, the fly extends its proboscis to consume the substance. Solutions of various sugars are very attractive to the fly.
07:03
Initiating Rapid Neurite Extension and Formation Functional Neuronal Connections
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2025
This video demonstrates a technique for the rapid initiation and extension of a neuron and creation of new connections with a target neuron using a microfluidic device and micromanipulation. This could be used for therapies that aim to reconnect neuronal circuits after trauma or in neurodegenerative diseases.
09:51
Measuring Plant Cell Wall Extension (Creep) Induced by Acidic pH and by Alpha-Expansin
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Cited by 43 •
2009
We demonstrate the use of a constant-force extensometer to measure long-term extension (creep) of plant cell wall specimens induced by acidic buffers and expansin protein.
FAQs
Wrist extension helps position and stabilize the hand while the fingers and forearm carry out coordinated actions. During grasping or reaching, its value therefore depends not only on the direction of hand movement but also on when the extensor muscles contract relative to finger and forearm activity. Researchers can use this relationship to examine how upper-limb motor control supports purposeful behavior.
The extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi ulnaris contribute to controlled hand stabilization and repositioning. Their activity supports actions in which the hand must remain appropriately organized while the fingers or forearm move. Examining these muscles helps connect specific muscular contributions with broader patterns of motor behavior rather than treating hand movement as an isolated event.
Timing determines how wrist extension is integrated with finger and forearm actions. A movement may require the wrist to stabilize the hand at one point and reposition it at another, depending on the behavioral task. Measuring when extension occurs can therefore reveal aspects of coordination and motor control during reaching, grasping, tool use, or gesture production.
These measurements provide complementary information about neuromuscular function. Range indicates how far the movement can be performed, strength reflects the force capacity associated with it, and timing describes its coordination within an action. Considering all three measures gives clinicians a broader basis for evaluating upper-limb performance and identifying changes associated with injury or recovery.
Researchers examine it when investigating behaviors that require the hand to stabilize, reposition, or coordinate with other parts of the upper limb. Relevant contexts include grasping, reaching, tool use, posture, and gesture production. Comparing wrist activity across these behaviors can clarify how motor control adapts hand positioning to different functional demands.
Clinicians can assess the movement's range, strength, and timing to evaluate neuromuscular function after injury. These measures help describe whether upper-limb control is limited and provide indicators for tracking recovery over time. Because wrist extension contributes to coordinated hand and forearm actions, its assessment can also relate physical changes to functional behaviors such as grasping or reaching.