The muscle in the anterior compartment that the forearm space organised right into three layers:

Superficial: flexor carpi ulnaris, palmaris longus, flexor carpi radialis, pronator teres.

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Intermediate: flexor digitorum superficialis.Deep: flexor pollicis longus, flexor digitorum profundus and pronator quadratus.

This muscle group is linked with pronation the the forearm, flexion the the wrist and also flexion the the fingers.

They are mostly innervated by the median nerve (except for the flexor carpi ulnaris and medial half of flexor digitorum profundus, which space innervated by the ulnar nerve), and also they recieve arterial it is provided from the ulnar artery and radial artery

In this article, us shall look at the anatomy of the muscles in the anterior compartment of the forearm – your attachments, actions, innervation and clinical correlations.


Superficial Compartment

The superficial muscles in the anterior compartment room the flexor carpi ulnaris, palmaris longus, flexor carpi radialis and pronator teres.

They all originate native a typical tendon, which occurs from the medial epicondyle the the humerus.

Flexor Carpi Ulnaris

Attachments: The flexor carpi ulnaris has actually two origins. The humeral head originates native the medial epicondyle of the humerus v the other superficial flexors, whilst the ulnar head originates native the olecranon of the ulnar.The muscle tendon passes right into the wrist and also attaches to the pisiform bone, hook of hamate, and base that the 5th metacarpalActions: Flexion and adduction in ~ the wrist.

Palmaris Longus

This muscle is missing in about 15% that the population.

Attachments: Originates indigenous the medial epicondyle, attaches come the flexor retinaculum that the wrist.Actions: Flexion in ~ the wrist.

Flexor Carpi Radialis

Attachments: Originates native the medial epicondyle, attaches to the basic of metacarpals II and III.Actions: Flexion and abduction at the wrist.Innervation: mean nerve.

Pronator Teres

The lateral border of the pronator teres forms the medial border of the cubital fossa, one anatomical triangle situated over the elbow.

Actions: Pronation of the forearm.InnervationMedian nerve.
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Fig 1 – The superficial muscles of the anterior forearm.


Intermediate Compartment

The flexor digitorum superficialis is the just muscle the the intermediate compartment. It have the right to sometimes it is in classed together a superficial muscle, yet in many individuals, the lies between the deep and superficial muscle layers.

The muscle is a great anatomical landmark in the forearm – the median nerve and ulnar artery pass in between its two heads, and also then travel posteriorly.

Actions: Flexes the metacarpophalangeal joints and also proximal interphalangeal joints in ~ the 4 fingers, and also flexes at the wrist.Innervation: median nerve.

Deep Compartment

There room three muscle in the deep anterior forearm: flexor digitorum profundus, flexor pollicis longus, and also pronator quadratus.

Flexor Digitorum Profundus

Actions: it is the only muscle that deserve to flex the distal interphalangeal joints of the fingers. It also flexes in ~ metacarpophalangeal joints and also at the wrist.

Flexor Pollicis Longus

This muscle lies laterally come the FDP.

Attachments: Originates indigenous the anterior surface of the radius and surrounding interosseous membrane. Attaches to the basic of the distal phalanx of the thumb.Actions: Flexes the interphalangeal joint and metacarpophalangeal share of the thumb.Innervation: typical nerve (anterior interosseous branch).

Pronator Quadratus

A square shame muscle found deep to the tendons that the FDP and also FPL.

Attachments: Originates indigenous the anterior surface ar of the ulna and also attaches come the anterior surface of the radius.Actions: Pronates the forearm.Innervation: typical nerve (anterior interosseous branch).

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Fig 2 – Deep flexor muscles of the anterior forearm.