Supinator muscle 3042748 223079850 2008-07-02T13:54:36Z Vedran12 7322109 interwiki hr {{Muscle infobox | Name = Supinator muscle | Latin = musculus supinator | GraySubject = 125 | GrayPage = 454 | Image = Gray420.png | Caption = The Supinator. Posterior view.| Image2 = | Caption2 = | Origin = [[Lateral epicondyle]] of [[humerus]], [[supinator crest]] of [[ulna]], [[radial collateral ligament]], [[annular ligament]]| Insertion = Lateral proximal [[radial shaft]] | Action = [[supinates]] [[forearm]] | Antagonist = [[Pronator teres muscle|Pronator teres]], [[Pronator quadratus]] | Blood = [[radial recurrent artery]] | Nerve = Posterior interosseus branch of [[radial nerve]] | MeshName = | MeshNumber = | DorlandsPre = m_22 | DorlandsSuf = 12551025 | }} The '''Supinator''' is a broad muscle, curved around the upper third of the [[radius (bone)|radius]]. ==Origin and insertion== It consists of two planes of fibers, between which the [[deep branch of the radial nerve]] lies. The two planes arise in common&mdash;the superficial one by [[Tendon| tendinous]] (the initial portion of the muscle is actually just tendon) and the deeper by muscular fibers—from the [[lateral epicondyle of the humerus]]; from the [[radial collateral ligament (elbow)| radial collateral ligament]] of the [[elbow-joint]], and the [[annular ligament]]; from the ridge on the [[ulna]], which runs obliquely downward from the dorsal end of the [[radial notch]]; from the triangular depression below the notch; and from a tendinous expansion which covers the surface of the muscle. The ''superficial fibers'' 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'' of the deeper plane form a sling-like [[fasciculus]], which encircles the neck of the radius above the tuberosity and is attached to the back part of its medial surface; the greater part of this portion of the muscle is inserted into the dorsal and lateral surfaces of the body of the radius, midway between the oblique line and the head of the bone. ==Action== The action of the Supinator is suggested by its name; it assists the Biceps in bringing the hand into the supine position. ==General use of term== The term "Supinator" can also refer more generally to a muscle that causes [[Supine position|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. ==Additional images== <gallery> Image:Gray213.png|Bones of left forearm. Anterior aspect. Image:Gray214.png|Bones of left forearm. Posterior aspect. Image:Musculussupinator.png|Front of the left forearm. Deep muscles. Image:Gray419.png|Posterior surface of the forearm. Deep muscles. Image:Gray528.png|Ulnar and radial arteries. Deep view. Image:Gray529.png|Arteries of the back of the forearm and hand. </gallery> ==External links== * {{MuscleLoyola|sup}} * {{MuscleUWash|supinator}} {{Gray's}} {{Muscles_of_upper_limb}} {{muscle-stub}} [[Category:Muscles of the upper limb]] [[ar:عضلة استلقائية]] [[de:Musculus supinator]] [[fr:Muscle supinateur]] [[hr:Supinacijski mišić]] [[la:Musculus supinator]] [[hu:Hanyintó alkari izom]] [[ja:回外筋]] [[pl:Mięsień odwracacz]] [[pt:Músculo supinador]] [[sv:Supinator]] [[th:กล้ามเนื้อสุพิเนเตอร์]]