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The forearm is the region of the upper limb between the elbow and the wrist. The forearm contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm is divided into two muscular compartments: the anterior flexor compartment and the posterior extensor compartment. The forearm muscles are essential to the fine motor actions of the upper limb, allowing for complex movements of the arm, wrist, and fingers. The forearm muscles are responsible for flexion and extension of the wrist and digits.
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What You'll Learn
- Forearm muscles are divided into two compartments: anterior (flexor) and posterior (extensor)
- The forearm contains two long bones: the radius and the ulna
- The anterior forearm muscles include flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and pronator teres
- The forearm muscles are essential for fine motor actions of the upper limb
- The brachioradialis is a paradoxical muscle: it originates and is innervated like an extensor muscle, but is a flexor
Forearm muscles are divided into two compartments: anterior (flexor) and posterior (extensor)
The forearm is the region of the upper limb between the elbow and the wrist. The forearm contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm is covered by skin, the anterior surface usually being less hairy than the posterior surface.
The posterior extensor muscles produce extension at the wrist and fingers. These muscles are innervated by the radial nerve. The superficial layer of the posterior forearm contains seven muscles. Four of these muscles—extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris, and extensor digiti minimi—share a common tendinous origin at the lateral epicondyle. The extensor digitorum and extensor digiti minimi are innervated by the radial nerve (deep branch). The extensor carpi ulnaris is located on the medial aspect of the posterior forearm.
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The forearm contains two long bones: the radius and the ulna
The forearm is the region of the upper limb between the elbow and the wrist. The forearm contains two long bones: the radius and the ulna. The radius is located on the lateral side, and the ulna is located on the medial side. These forearm bones articulate with each other in two locations. The head of the radius forms a joint with the radial notch of the ulna proximally (proximal radioulnar joint), while the head of the ulna forms a joint with the ulnar notch of the radius distally (distal radioulnar joint). The forearm bones are connected by the interosseous membrane, which also forms a boundary between the two muscular compartments of the forearm: the anterior (flexor) and posterior (extensor) compartments.
The anterior compartment contains the flexor muscles, which are responsible for flexion and pronation at the wrist, and flexion of the digits. The flexor muscles are separated into three layers: the superficial layer, which includes the flexor carpi ulnaris, palmaris longus, flexor carpi radialis, and pronator teres; the intermediate layer, which includes the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus; and the deep layer, which includes the pronator quadratus. The flexor digitorum superficialis is the largest muscle of the superficial anterior forearm muscles, consisting of two heads that originate from the medial epicondyle of the humerus and the coronoid process of the ulna, respectively.
The posterior compartment contains the extensor muscles, which are responsible for extension at the wrist and fingers. These muscles are organised into two layers: the deep layer and the superficial layer, which contains seven muscles, including the extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris, and extensor digiti minimi. Some extensor muscles, such as the anconeus, are not visible as they are situated proximally in the forearm.
The forearm muscles are essential to the fine motor actions of the upper limb, allowing for complex movements of the arm, wrist, and fingers. They work together to move the elbow, forearm, wrist, and digits of the hand. The intrinsic muscles function to move the forearm by pronating and supinating the radius and ulna, while the extrinsic muscles flex and extend the digits of the hand.
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The anterior forearm muscles include flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and pronator teres
The forearm is the region of the upper limb between the elbow and the wrist. It contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm can be brought closer to the upper arm (flexed) and brought away from the upper arm (extended) due to movement at the elbow. The forearm can also be rotated so that the palm of the hand rotates inwards (pronated) and outwards (supinated) due to movement at the elbow and the distal radioulnar joint.
The forearm has two muscular compartments: an anterior (flexor) and a posterior (extensor) compartment. The anterior forearm muscles include flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and pronator teres. These muscles are located in the anterior (flexor) compartment of the forearm and are known as the superficial anterior forearm muscles. They share a common origin on the common flexor tendon, which arises from the medial epicondyle of the humerus.
The flexor carpi radialis is a fusiform muscle situated medially to the pronator teres muscle. It originates from the medial epicondyle of the humerus and extends into a long tendon that passes beneath the flexor retinaculum and inserts onto the bases of the metacarpal bones 2-3. It is innervated by the median nerve (C6, C7) and vascularized by the branches of the recurrent ulnar and radial arteries.
The flexor carpi ulnaris is the most medial muscle of this group and has two origins: the humeral head, which arises from the medial epicondyle of the humerus, and the ulnar head, which arises from the olecranon and proximal two-thirds of the posterior surface of the ulna. The muscle tendon passes into the wrist and attaches to the pisiform bone, hook of hamate, and base of the 5th metacarpal. It is the only muscle in this group that receives its innervation via the ulnar nerve (C7-T1).
The palmaris longus is the most superficial muscle of the superficial anterior forearm muscles. It is considered a vestigial structure as approximately 14% of the population has a unilateral or bilateral absence of this muscle.
The pronator teres muscle is innervated by the median nerve (C6, C7) and receives its blood supply from the brachial, radial, and ulnar arteries. Its main action is the pronation of the forearm at the proximal radioulnar joint, and it also contributes to the flexion of the forearm at the elbow joint.
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The forearm muscles are essential for fine motor actions of the upper limb
The forearm is the region of the upper limb between the elbow and the wrist. The forearm contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm is divided into two muscular compartments: the anterior (flexor) and posterior (extensor) compartments. These compartments contain twenty muscles that act on the elbow and wrist joints, as well as the carpometacarpal, metacarpophalangeal, and interphalangeal joints of the hand.
The muscles in the posterior compartment are commonly known as the extensor muscles, and they produce extension at the wrist and fingers. These muscles are organised into two layers: deep and superficial. The superficial layer of the posterior forearm contains seven muscles, four of which are the extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris, and extensor digiti minimi. The deep layer of the posterior compartment contains five muscles, including the supinator and abductor pollicis longus.
The forearm muscles are innervated by three main nerves: the median, ulnar, and radial nerves. The median nerve supplies the anterior compartment, the ulnar nerve supplies some medial muscles, and the radial nerve supplies the muscles of the posterior compartment.
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The brachioradialis is a paradoxical muscle: it originates and is innervated like an extensor muscle, but is a flexor
The forearm is the region of the upper limb between the elbow and the wrist. It contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm can be brought closer to the upper arm (flexed) and brought away from the upper arm (extended) due to movement at the elbow.
The forearm contains many muscles, including the flexors and extensors of the wrist, flexors and extensors of the digits, a flexor of the elbow (brachioradialis), and pronators and supinators. The brachioradialis is a fusiform muscle located in the lateral part of the posterior forearm. It originates from the upper two-thirds of the lateral supracondylar ridge of the humerus and the anterior surface of the lateral intermuscular septum of the arm.
The brachioradialis is considered a posterior or extensor-compartment muscle, though it functions as a flexor. This unique muscle is one of two forearm extensor-compartment muscles that do not cross the wrist, the other being the supinator. The brachioradialis flexes, pronates, and supinates the forearm but is innervated by the radial nerve. The radial nerve usually innervates extensors. Therefore, the brachioradialis is a paradoxical muscle: it originates and is innervated like an extensor muscle, but is a flexor.
The brachioradialis muscle works in synergy with the biceps brachii and brachialis to flex the forearm at the elbow. It is most visible when the forearm is half pronated, and flexing at the elbow against resistance. The muscle is also important in hand defect reconstruction, forearm tendon transfers, and carpal tunnel release.
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Frequently asked questions
The forearm is the region of the upper limb between the elbow and the wrist. The forearm contains two long bones, the radius and the ulna, forming the two radioulnar joints. The forearm muscles are divided into two compartments: the anterior flexor compartment and the posterior extensor compartment.
The anterior compartment contains the flexor muscles, which are responsible for flexion and pronation at the wrist, and flexion of the digits. The superficial anterior forearm muscles are a group of five muscles: pronator teres, flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and flexor digitorum superficialis.
The muscles in the posterior compartment are commonly known as the extensor muscles, which produce extension at the wrist and fingers. There are seven muscles in the superficial layer of the posterior forearm, including the extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris, and extensor digiti minimi.
The forearm muscles are essential for fine motor actions of the upper limb, allowing for complex movements of the arm, wrist, and fingers. They are responsible for flexion and extension of the wrist and digits, as well as pronation and supination of the forearm.
A chronic false strain of the superficial anterior forearm muscles can lead to inflammation and increased connective tissue in the common flexor tendon. This condition is often referred to as "golfer's elbow" due to its prevalence among golfers, causing pain during hand movements and trouble with day-to-day tasks.
