What Is The Extensor Muscle That Branches To Form Four Tendons On The Back Of The Hand?

As it courses the dorsum of the hand,

the extensor digitorum communis muscle

spreads out into four (4) flat tendons deep to the extensor retinaculum to the medial four fingers.

What is the extensor muscle?

Extensor muscle,

any of the muscles that increase the angle between members of a limb

, as by straightening the elbow or knee or bending the wrist or spine backward. … In humans, certain muscles of the hand and foot are named for this function.

What are the extensor muscles of the wrist?

What is the extensor digitorum muscle?

The extensor digitorum communis is

a superficial extensor muscle located in the posterior compartment of the forearm

. It shares a common synovial tendon sheaths along with other extensor muscles which helps to reduce friction between the tendon and the surrounding structures.

How many wrist extensor muscles are there?

Now let’s look at the muscles which produce wrist movement. There are three flexors and

three extensors

.

What is the muscle in your wrist called?

The

extensor carpi radialis longus, extensor carpi radialis brevis

, and extensor carpi ulnaris muscles all extend the hand at the wrist, with the radialis muscles abducting the hand and the ulnaris adducting it.

Which group of muscles would radially deviate the wrist?

Radial Deviation: tilting the hand and wrist toward the thumb and radius. Muscles include:

Flexor Carpi Radialis & Extensor Carpi Radialis

(they work together to cancel the flexion and extension and instead just pull toward the radius).

What is an example of an extensor muscle?

The opposing muscle of a flexor is called the “extensor” muscle. Your

triceps

is an extensor. When you contract your triceps your arm straightens and the angle between the forearm and the upper arm increases.

Which finger has a specific muscle to extensor digitorum?

The tendon to the

index finger

is accompanied by the tendon of extensor indicis, which lies on its ulnar side.

Does an extensor open or close a joint?

An extension is a physical position that increases the angle between the bones of the limb at a joint. … In other words, that

joint can basically be opened until it is straight

. Think of your arm or leg as an example, as these can be unbent until they are virtually straight, but not beyond that point.

Why does my extensor digitorum hurt?

Share on Pinterest Extensor tendons connect muscle to bone in the hand and foot, and extensor tendonitis is commonly caused

by overuse

. The most common cause is overuse of the muscles, bones, and tendons in the feet or hands. In the feet, it’s most often caused by: spending a lot of time on the feet.

How do you test for extensor digitorum?

The test is performed by

tapping the extensor digitorum muscle while the fingers are light or half flexed

. A sudden contraction of the musculus extensor digitorum and extension of the fingers indicate a normal reflex.

What is the most likely to be the action of the extensor digitorum?

Is there a muscle in your wrist?

There are

6 main muscles

that flex the wrist. Three of the muscle originate on the humorous and cross the forearm and extent through the wrist via tendons and insert into the bones of the hand. These muscles are: the flexor carpus radialis, flexor carpus ulnaris, and palmaris longus.

What is the common origin of the wrist extensor muscles?

What is the 4 main muscles involved in wrist extension?

The primary muscles involved in wrist extension, which act on the wrist only, are

the extensor carpi radialis longus, extensor carpi radialis brevis and the extensor carpi ulnaris

. All of these muscles need to be fired simultaneously to avoid any radial or ulnar deviation with extension.