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Extensor digitorum muscle

Synonyms: extensor digitorum communis muscle, finger extensor
German: Musculus extensor digitorum

1 Definition

The extensor digitorum muscle is a muscle that belongs to the superficial layer of extensors of the forearm.

2 Devolution

2.1 Origin

The extensor digitorum muscle has its origin at the lateral epicondyle - lateral to the extensor carpi ulnaris muscle. Moreover, it has surfaces of origin at the septa that separate it from the neighboring muscles, and at the antebrachial fascia.

2.2 Insertion

The muscle passes almost in the middle of the dorsal side of the forearm into distal direction and finally divides into four tendon that draw to the wrist. These pass below the extensor retinaculum in the fourth tendon sheath compartment further into distal direction, and they separate on the back of the hand to pass to the fingers II to V from there. There, they unite with the dorsal aponeurosis of their respective fingers and insert in their middle and phalanxlend phalanx / medial and distal phalanges).

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2.3 Varieties

In some cases, you can observev an autonomous muscle belly of the tendon for the index finger. Moreover, the tendon for the little finger can be missing. Also, there have been double tendons documented for the individual fingers.

3 Innervation

The innervation of the extensor digitorum muscle is provided by the profound branch of the radial nerve, with fibers from the C7 and C8 segments.

4 Function

The extensor digitorum muscle effects an extension of the fingers II to V, and an extension (dorsal flexion) in the wrist.

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