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The wrist is a complex joint that allows for several types of movement, including flexion, extension, radial deviation, and ulnar deviation. The forearm, wrist, and hand can also rotate in pronation and supination movements. Several muscles in the forearm control the rotation of the wrist and hand. When the elbows are bent at a 90-degree angle, the supinator muscle rotates the palm upwards. The pronator teres and pronator quadratus work in the opposite direction to turn the palm down. The supinator muscle is located just below the elbow and provides about half the power of the biceps muscle for supination. The pronator quadratus muscle is found in the forearm just below the wrist and allows us to twist our forearm into the palm-down position (pronation).
| Characteristics | Values |
|---|---|
| Muscles that twist the wrist | Supinator, pronator teres, pronator quadratus |
| Location of supinator muscle | Just below the elbow |
| Function of supinator muscle | Rotates the palm upwards |
| Location of pronator teres and pronator quadratus muscles | Forearm, just below the wrist |
| Function of pronator teres and pronator quadratus muscles | Rotate the palm downwards (pronation) |
| Types of wrist movements | Flexion, extension, radial deviation, ulnar deviation, pronation, supination |
| Muscles involved in flexion | Flexor carpi ulnaris, flexor carpi radialis, palmaris longus, flexor digitorum superficialis |
| Muscles involved in extension | Extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum |
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What You'll Learn
Forearm muscles that twist the wrist
The wrist and forearm are complex structures of small bones connected by ligaments. The wrist shares muscles with the forearm, and these muscles are responsible for various types of movements, including flexion, extension, adduction, and abduction.
Several muscles in the forearm control the rotation of the wrist. When the elbows are bent at a 90-degree angle, the supinator muscle rotates the palm upwards. The supinator is located just below the elbow and provides about half the power of the biceps muscle for supination. The supinator is also important as a location where the radial nerve can be entrapped.
The pronator teres and pronator quadratus muscles work in the opposite direction to turn the palm down. The pronator quadratus muscle is found in the forearm just below the wrist and has two heads, arising from the ulna and inserting onto the radius. These muscles, along with the pronator teres, allow us to twist our forearm into the palm-down position (pronation).
The forearm/wrist/hand can also rotate in supination and pronation movements. Supination of the forearm refers to twisting the forearm into the palm-up position. Pronation, on the other hand, is twisting the forearm into the palm-down position. These movements are made possible by the muscles in the forearm that control the rotation of the wrist.
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Flexion and extension muscles
The wrist is a complex network of bones, muscles, nerves, tendons, and ligaments. The wrist shares muscles with the forearm, and these muscles work in groups to allow for the dexterity and movement of the wrist's joints.
Flexion Muscles
Flexion muscles allow you to move your wrist down towards your palm. These muscles include:
- Flexor Carpi Ulnaris (prime mover)
- Flexor Carpi Radialis (prime mover)
- Palmaris longus (tightens the skin and fascia in the palm)
- Flexor Digitorum Superficialis (finger flexor, assists only)
Extension Muscles
Extension muscles pull your wrist up, like when you make a "stop" gesture. These muscles include:
- Extensor Carpi Radialis Longus (prime mover)
- Extensor Carpi Radialis Brevis (prime mover)
- Extensor Carpi Ulnaris
- Extensor Digitorum (assists only)
The Extensor Retinaculum anchors the extensor tendons and assists in supporting the posterior structure of the wrist.
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Adduction and abduction muscles
The adduction muscle that bends the wrist inward is the extensor carpi ulnaris. This muscle is responsible for producing the adduction movement at the wrist joint, allowing the wrist to bend toward the centre of the body.
The abduction muscles that bend the wrist outward are the abductor pollicis longus, flexor carpi radialis, extensor carpi radialis longus, and extensor carpi radialis brevis. These muscles work together to produce the abduction movement at the wrist joint, allowing the wrist to bend away from the centre of the body.
It is important to note that the wrist shares muscles with the forearm, and the muscles that produce adduction and abduction movements at the wrist joint are primarily located in the forearm. These muscles are known as extrinsic muscles or external to the hand. On the other hand, the muscles within the wrist and hand are referred to as intrinsic muscles.
Additionally, it is worth mentioning that the supinator muscle, located just below the elbow, plays a role in twisting the forearm into the palm-up position. Similarly, the pronator quadratus and pronator teres muscles allow for twisting the forearm into the palm-down position, also known as pronation. These muscles are essential in providing the power and stability needed for various movements and can be involved in injuries such as golfer's elbow.
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Supination and pronation
The wrist and forearm are complex structures that work together to allow hand movement. The forearm has two main bones: the radius and ulna, which connect to the wrist. The wrist contains eight small carpal bones. The distal radioulnar joint links the forearm to the wrist, allowing the radius to rotate around the ulna. The radiocarpal joint connects the radius to the first row of carpal bones, enabling the wrist to bend and extend. The midcarpal joint sits between the two rows of carpal bones and helps with side-to-side wrist motion.
Several muscles control wrist and forearm movement. The supinator and biceps brachii are responsible for supination, which is the act of twisting the forearm into the palm-up position. The supinator is located just below the elbow and provides about half the power of the biceps muscle for supination. The biceps brachii also stabilises the elbow during supination, preventing the elbow from bending with every twist.
Pronation is the act of twisting the forearm into the palm-down position. The pronator teres and pronator quadratus muscles are responsible for this movement. The pronator quadratus muscle is found in the forearm just below the wrist and has two heads, arising from the ulna and inserting onto the radius.
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Tendon injuries from twisting
The wrist is a complex part of the body, with a network of bones, muscles, nerves, connective tissue, and blood vessels. Twisting the wrist involves the movement of several muscles and tendons. The act of twisting the forearm into the palm-up position is called supination, and the muscle involved is the supinator, located just below the elbow. The supinator provides about half the power of the biceps muscle for supination.
The wrist can be twisted into the palm-down position, known as pronation, with the help of the pronator quadratus muscle, found in the forearm just below the wrist. This muscle works together with the pronator teres to allow pronation.
The wrist contains many tendons that enable the movement of the wrist, hand, and fingers. These tendons can be injured through twisting motions, leading to conditions such as wrist tendonitis (tendinitis) and wrist sprains.
Wrist tendonitis is the inflammation of a tendon in the wrist, often caused by repetitive motions or injury. It can develop in any of the tendons in the wrist and is characterised by symptoms such as pain, swelling, and reduced mobility. Certain activities that involve repetitive wrist motions or put a lot of stress on the wrists increase the risk of developing tendonitis. New mothers who hold babies for extended periods are also prone to this condition, often referred to as "mommy's wrist" or de Quervain's tendinitis.
Wrist sprains are common injuries that occur when the ligaments in the wrist are stretched or torn, often due to falls, sports injuries, or trauma. Twisting motions can cause wrist sprains, and they can lead to further complications such as bone fractures and tendon injuries.
Treatment for tendon injuries from twisting can vary depending on the severity and location of the injury. Initial treatment often involves the RICE method (rest, ice, compression, and elevation) to reduce swelling and pain. In some cases, a splint or brace may be recommended to immobilise the wrist. If symptoms persist or there is significant damage to the tendon, surgery may be required to release the tendon and provide more room for movement.
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Frequently asked questions
The supinator muscle, located just below the elbow, rotates the palm upwards. The pronator teres and pronator quadratus muscles work in the opposite direction to turn the palm downwards.
The supinator muscle is located just below the elbow and provides about half the power of the biceps muscle for supination. The pronator quadratus muscle is found in the forearm just below the wrist.
Tendonitis is a common injury that occurs with repetitive overuse. De Quervain's Tenosynovitis occurs with repetitive gripping and rotations, causing irritation and inflammation of the tendons on the thumb side of the wrist. Extensor Carpi Ulnaris (ECU) Tendonitis occurs with twisting and extension of the wrist in sports like tennis and basketball.
Most tendon injuries can resolve over time with rest and icing. If pain persists, consult an orthopedic physician to determine if surgical intervention or physical therapy is required.
