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Flexor digitorum superficialis muscle

Synonyms: Perforatus muscle, superficial finger flexor
German: Musculus flexor digitorum superficialis

1 Definition

The flexor digitorum superficialis muscle belongs to the superficial layer of the flexors of the forearm. It is a two-headed muscle where you can differentiate between a Caput humeroulnare and a Caput radiale.

2 Devolution

2.1 Origin

The Caput humeroulnare has its origins at the medial epicondyle of the humerus, at the coronoid process of the ulna, as well as at the antebrachial fascia. The Caput radiale has its origin at the anterior surface of the radius.

2.2 Insertion

The tendon passes under the flexor retinaculum through the carpal tunnel, and, before insertion, it divides into 4 terminal tendons that insert on the lateral side of the medial phalanges (middle phalanges) of the 2nd to 5th finger. Shortly before their insertions, the tendos divide once again into two separated reins. The tendons of the flexor digitorum profundus muscle pass through gaps between the two reins, which is also called chiasm of digits of hand.

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3 Innervation

The innervation of the flexor digitorum superficialis muscle is provided by the medianus nerve, with fibers from the C7 and C8 segments.

4 Function

As you can deduct from the name "flexor digitorum superficialis muscle", the muscle effects a flexion of the wrist and of the 2nd to the 5th finger until the middle phalanx.

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