pronator quadratus


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pronator quadratus

[prōnā′tər]
a muscle of the forearm. It originates on the distal fourth of the anterior surface and border of the ulna and inserts onto the distal fourth of the anterior surface of the radius. It functions to pronate the forearm and hand.
References in periodicals archive ?
From top to bottom EMGs of extensor carpi radialis, palmaris longus, pronator quadratus and flexor digitorum superficialis muscles are plotted respectively.
In this study SEMGs acquired from four muscles; extensor carpi radialis, palmaris longus, pronator quadratus, flexor digitorum superficialis from three subjects (two females and two male) for five hand movements; finger flexion, wrist flexion, wrist extension, pronation, supination have been classified.
The dorsal sheath is then incised to reveal the pronator quadratus muscle, which is then reflected off the radius to reveal the underlying bone.
The pronator quadratus muscle is the main responsible for the pronation of forearm, and is helped by the pronator teres muscle.
AIN branches posterior from median nerve between 2 heads of PT and with anterior interosseous artery it descend anterior to interosseous membrane between and deep to FPL and Flexor digitorum profundus (FDP) and supply both and terminate posterior to pronator quadratus.
9] Symptoms can occur from direct compression, edema of the tenosynovium, swollen pronator quadratus muscle, hematoma in the carpal canal or, rarely, from bony fractured edges.
The muscle fibres were directed downwards and medially, lying superficial to the anterior interosseous nerve, vessels and superficial to the pronator quadratus (figure 1).
The extensor carpi ulnaris (ECU) subsheath and the interosseous membrane (IOM) are assisted by the pronator quadratus, which actively compresses the ulnar head into the sigmoid notch, and by the flexors and extensors of the forearm, which dynamically compress the DRUJ.
Once pronator quadratus exposed with its covering sheath a (L) shaped incision made over muscle and it is retracted to expose the fracture site.
This may be done by a variety of methods including a slip of dorsal retinaculum or a transfer of the pronator quadratus to the ECU sheath dorsally.
The pronator quadratus branch of the anterior interosseus nerve (AIN) to the motor branch of the ulnar nerve at Guyon's canal; and