In human anatomy, the
supinator is a broad muscle in the
posterior compartment of the forearm, curved around the upper third of the
radius. Its function is to
supinate the forearm.
Terminology
The term "supinator" can also refer more generally to a muscle that causes supination of a part of the body. In older texts, the term "supinator longus" was used to refer to the
brachioradialis, and "supinator brevis" was used to the muscle now known as the supinator.
Origin and insertion
Supinator consists of two planes of fibers, between which the
deep branch of the radial nerve lies. The two planes arise in common — the superficial one by
tendinous (the initial portion of the muscle is actually just tendon) and the deeper by muscular fibers —
Gray's Anatomy (1918), see infobox from the
supinator crest of
ulna, the
lateral epicondyle of
humerus, the
radial collateral ligament, and the
annular radial ligament.
The superficial fibers (
pars superficialis) surround the upper part of the radius, and are inserted into the lateral edge of the
radial tuberosity and the oblique line of the radius, as low down as the insertion of the
pronator teres. The upper fibers (
pars profunda) of the deeper plane form a sling-like
fasciculus, which encircles the neck of the radius above the tuberosity and is...
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