supinator muscle


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su·pi·na·tor mus·cle

(sū'pi-nā'tŏr mŭs'ĕl)
Origin, lateral epicondyle of humerus, radial collateral and anular ligaments, and supinator ridge of ulna; insertion, anterior and lateral surface of radius; action, supinates the forearm; nerve supply, radial (posterior interosseous).
Synonym(s): musculus supinator [TA] .
References in periodicals archive ?
In 12 limbs, the branch destined to the PL could be connected to the PIN, distally to the branches to the supinator muscle even with full range of motion of the forearm.
As noted by Abrams and associates, (4) the PIN exits the supinator muscle on average 7.0 cm from the radiocapitellar joint, making it especially vulnerable to injury at all points proximal to this.
Thus, intra-operative nerve exploration must be conducted with sufficient accuracy, particularly in fractures of proximal third, as when dividing supinator muscle, it should be dissected layer by layer to prevent nerve damage.
It bifurcates at the level of the elbow joint into the superficial nerve, which courses dorsally under the extensor carpi radialis brevis, and the PIN, which dives under the superficial head of the supinator muscle and continues along with the posterior interosseous artery to supply all of deeper lying extensor muscles.
This condition is indicated by pain on resisted supination with the elbow flexed (entrapment in the supinator muscle) or pain with resisted long finger extension (Maudsley's test) when the elbow is extended (entrapment in the ECRB muscle).
Their anatomic studies have shown not only a soft tissue connection of the annular ligament with the superficial wrist extensors but, when the tendenous part of the supinator muscle was removed it was observed that the active muscle fibres were attached to the annular ligament.
Since the supinator muscle does not have ulnar origin, the ulna of Saguinus leucopus does not form a supinator crest as it does in humans (Standring; Moore et al.) and as it should happen in nonhuman primates whose ulnar origin lies in the supinator muscle (Cribillero et al., 2009; Michilsens et al, 2009; Aversi-Ferreira et al, 2010; Diogo et al, 2012; Diogo & Wood, 2012).