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Is the pronator quadratus a flexor or extensor?

Author

James Craig

Updated on February 21, 2026

Is the pronator quadratus a flexor or extensor?

Muscles of the Forearm Flexor Region
MuscleOriginAction
palmaris longuscommon flexor tendon, from the medial epicondyle of the humerusflexes the wrist
pronator quadratusmedial side of the anterior surface of the distal one-fourth of the ulnapronates the forearm

Likewise, what is the pronator quadratus?

Pronator quadratus is a quadrangular, thin, short and flat muscle lying within the anterior compartment of forearm. It is part of the deep group of forearm flexors, together with flexor digitorum profundus and flexor pollicis longus. These three muscles are overlaid by the superficial group of forearm flexors.

Beside above, what nerve innervates the pronator quadratus? The PQ is innervated by the anterior interosseous nerve (AIN), a branch of the median nerve also supplying motor innervation to the flexor digitorum profundus (FDP) and flexor pollicis longus (FPL) muscles.

Just so, what is the action of the pronator teres and pronator quadratus?

Function. Pronator teres pronates the forearm, turning the hand posteriorly. If the elbow is flexed to a right angle, then pronator teres will turn the hand so that the palm faces inferiorly. It is assisted in this action by pronator quadratus.

Where does the pronator teres insertion?

Pronator teres muscle

OriginHumeral head: medial supracondylar ridge of humerus Ulnar head: Coronoid process of ulna
InsertionLateral surface of radius (distal to supinator)
ActionPronation of forearm at the proximal radioulnar joint, flexion of the forearm at the elbow joint
InnervationMedian nerve (C6, C7)

What is pronator teres syndrome?

What is Pronator Teres Syndrome? Pronator Teres Syndrome describes the signs and symptoms that results from compression of the median nerve by the pronator teres muscle near the elbow. It is similar to but discernable from its more common distal counterpart, carpal tunnel syndrome. (

What muscle does supination?

Biceps brachii acts primarily as an elbow flexor, and secondarily as a supinator. It is able to supinate when the elbow is flexed. When the elbow is fully extended, supinator performs the action.

What does the flexor digitorum profundus do?

Flexor digitorum profundus muscle is a powerful flexor of the fingers. As it pulls the distal phalanges towards the hand, it causes flexion of the digits 2-4 at the metacarpophalangeal and interphalangeal joints.

Where is the Supinator muscle located?

Supinator is a spiral muscle contained in the posterior compartment of the forearm, along with brachioradialis, and the superficial and deep forearm extensors. Supinator muscle curls around the proximal part of radius, connecting it with the ulna.

Which is the insertion of the pronator quadratus?

Lateral pterygoid muscle

What is the action of the flexor pollicis longus muscle?

The main function of the flexor pollicis longus is flexion of the thumb at the interphalangeal joint. Flexor pollicis longus is the only muscle that flexes the interphalangeal joint of the thumb, which makes it vital for activities that require hand gripping.

Where is the Brachialis muscle?

The brachialis muscle is a prime flexor of the forearm at the elbow joint. It is fusiform in shape and located in the anterior (flexor) compartment of the arm, deep to the biceps brachii.

How do you strengthen pronator teres?

Position the weight so that the majority of the weight is towards the thumb side. This position will force the forearm into a position of supination and stretch in particular the short ulnar head of the pronator teres. Hold each stretch for 30 seconds and repeat five times.

What causes pronator teres syndrome?

Pronator teres syndrome (PTS), first described by Henrik Seyffarth in 1951, is caused by a compression of the median nerve (MN) by the pronator teres (PT) muscle in the forearm. [1][2] The PT muscle is named because of its action and shape; it is a rounded muscle that pronates the forearm.

What nerve is responsible for pronation?

The median nerve passes between the two heads of pronator teres as it enters the forearm. Pronator teres inserts here, halfway down the lateral surface of the radius. Here's its action: pronation.

Which of the following is the sole action of the Brachialis muscle?

The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint. It lies deeper than the biceps brachii, and makes up part of the floor of the region known as the cubital fossa. The brachialis is the prime mover of elbow flexion.

What is the wrist muscle called?

Brachioradialis: Helps you twist your forearm so your palm is either facing up or down. Flexor carpi radialis: Helps you bend the wrist and move it toward the thumb. Palmaris longus: Helps you bend the wrist. Extensor pollicis brevis: Helps you straighten the thumb.

What muscle extends and adducts the wrist?

Summary table
MuscleOriginAction
Extensor carpi radialis breviscommon extensor tendonextends, abducts wrist
Extensor digitorumextends fingers, wrist
Extensor digiti minimiextends little finger at all joints
Extensor carpi ulnariscommon extensor tendon, ulnaextends, adducts wrist

What muscles does the median nerve innervate?

After emerging from the carpal tunnel, the median nerve transverses below the palmar aponeurosis and immediately gives off the (recurrent) thenar motor branch which supplies the thenar muscles of the hand: flexor pollicis brevis, abductor pollicis brevis, and opponens pollicis.

Will flexor carpi Radialis abduct or adduct the wrist?

The wrist is an ellipsoidal (condyloid) type synovial joint, allowing for movement along two axes. This means that flexion, extension, adduction and abduction can all occur at the wrist joint. Abduction - Produced by the abductor pollicis longus, flexor carpi radialis, extensor carpi radialis longus and brevis.

What artery supplies the pronator teres?

Pronator Teres
OriginMedial epicondyle of humerus and coronoid process of ulna
InsertionMiddle of lateral surface of radius
ActionPronates and flexes forearm (at elbow)
InnervationMedian nerve (C6, C7)
Arterial SupplyUlnar artery, anterior recurrent ulnar artery

What nerve Innervates the Supinator?

It is innervated by the deep branch of the radial nerve. The deep branch then becomes the posterior interosseous nerve upon exiting the supinator muscle.

Which muscle is an antagonist to both the biceps Brachii and Supinator?

triceps brachii muscle

Which muscle is responsible for creating opposition of the thumb?

opponens pollicis

On which side of the body are the elbow extensors located?

Elbow muscles are commonly referred to as flexors or extensors, depending on how they affect elbow movement. Extensors are on the inside of the arm and help extend the arm outward. Flexors are at the back of the elbow and pull it closer to the body by bending the elbow.

Which nerve Innervates flexor carpi Radialis?

median nerve

What Innervates the flexor digitorum profundus?

Gray's Anatomy states that the medial part of the flexor digitorum profundus (FDP; muscle bellies of the little and ring finger) is innervated by the ulnar nerve (UN), while the lateral part (muscle bellies of the middle and index fingers) is innervated by the anterior interosseous branch of the median nerve, C8 and T1

What is the flexor carpi ulnaris?

Flexor carpi ulnaris is a fusiform muscle located in the anterior compartment of the forearm. Flexor carpi ulnaris is the most medial of the superficial flexors. Together with other muscles of the anterior forearm, flexor carpi ulnaris flexes the hand at the wrist.

What is median nerve?

The median nerve is a mixed sensory and motor nerve. It is classically described as the nerve of pronation, of thumb, index finger, middle finger and wrist flexion, of thumb antepulsion and opposition, as well as the nerve of sensation for the palmar aspect of the first three fingers.

Where is the anterior interosseous nerve?

The anterior interosseous nerve (AIN) is the terminal motor branch of the median nerve. It branches from the median nerve in the proximal forearm just below to the elbow joint. It is about 5–8 cm distal to the lateral epicondyle and 4 cm distal to the medial epicondyle.

What are the forearm muscles?

The superficial compartment of the flexor surface of the forearm contains the pronator teres, the flexor carpi radialis longus, the palmaris longus, the flexor carpi ulnaris, and the flexor digitorum superficialis. All of these muscles originate primarily from the medial epicondyle of the humerus.

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