WordNet

make ones way by force; "He muscled his way into the office"
animal tissue consisting predominantly of contractile cells (同)muscular_tissue
one of the contractile organs of the body (同)musculus
authority or power or force (especially when used in a coercive way); "the senators used their muscle to get the party leader to resign"
a muscle that produces or assists in pronation

PrepTutorEJDIC

〈U〉(動物体の組織としての)『筋肉』,筋(きん);〈C〉(体の各部を動かす)筋肉 / 〈U〉力,(特に)筋力,腕力 / 《俗に》(…に)強引に割り込む《+『in on』(『into, through』)+『名』》
筋肉の,筋力のある / 力ずくの

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/12/18 12:18:26」(JST)

wiki en

Pronator quadratus is a square shaped muscle on the distal forearm that acts to pronate (turn so the palm faces downwards) the hand.

As it is on the anterior side of the arm, it is innervated by a branch of the median nerve, the anterior interosseous nerve (roots C8 and T1 with T1 being primary). Arterial blood comes via the interosseous artery.

Structure

Its fibers run perpendicular to the direction of the arm, running from the most distal quarter of the anterior ulna to the distal quarter of the anterior radius. It is the only muscle that attaches only to the ulna at one end and the radius at the end.

Function

When pronator quadratus contracts, it pulls the lateral side of the radius towards the ulna, thus pronating the hand. Its deep fibers serve to keep the two bones in the forearm bound together.

Additional Images

Pronator quadratus muscle
Pronator quadratus muscle
Pronator quadratus muscle
Pronator quadratus muscle

External links

114294862 at GPnotebook
Illustration: upper-body/pronator-quadratus from The Department of Radiology at the University of Washington

UpToDate Contents

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English Journal

Results of wrist extension reconstruction in C5-8 brachial plexus palsy by transferring the pronator quadratus motor branch to the extensor carpi radialis brevis muscle.

Bertelli JA1,2, Ghizoni MF1, Tacca CP2.
Journal of neurosurgery.J Neurosurg.2016 May;124(5):1442-9. doi: 10.3171/2015.3.JNS142428. Epub 2015 Oct 2.
OBJECT The objective of this study was to report the results of pronator quadratus (PQ) motor branch transfers to the extensor carpi radialis brevis (ECRB) motor branch to reconstruct wrist extension in C5-8 root lesions of the brachial plexus. METHODS Twenty-eight patients, averaging 24 years of ag
PMID 26430841

The "Four-Leaf Clover" Treatment Algorithm: A Practical Approach to Manage Disorders of the Distal Radioulnar Joint.

Kakar S1, Garcia-Elias M2.
The Journal of hand surgery.J Hand Surg Am.2016 Mar 2. pii: S0363-5023(16)00102-7. doi: 10.1016/j.jhsa.2016.01.005. [Epub ahead of print]
Most symptomatic distal radioulnar joint (DRUJ) conditions result from derangements to several structures that may include the length, shape, and/or orientation of the articulating surfaces; the cartilage of the DRUJ and/or ulnocarpal joint; the DRUJ and/or ulnocarpal joint ligaments; and the extens
PMID 26944032

Diagnostic value of the radiographic muscle-to-bone thickness ratio between the pronator quadratus and the distal radius at the same level in undisplaced distal forearm fracture.

Sun B1, Zhang D2, Gong W3, Huang S4, Luan Q5, Yang J6, Wang D7, Tian J8.
European journal of radiology.Eur J Radiol.2016 Feb;85(2):452-8. doi: 10.1016/j.ejrad.2015.12.002. Epub 2015 Dec 4.
PURPOSE: To investigate the value of the muscle-to-bone ratio (MBR), which is the ratio between the maximum pronator quadratus thickness (mPQT) and the distal radial thickness (DRT) at the same level, in comparison with mPQT in the diagnosis of undisplaced fractures in distal forearm (FDF) on radiog
PMID 26781151

Japanese Journal

方形回内筋の走行異常が原因と考えられた前腕回旋障害の1例

望月祐輔,澤泉卓哉,角田隆,堀口元,福田慶一,松井秀平,伊藤博元,高井信朗
関東整形災害外科学会雑誌 42(5), 292-295, 2011-10-01
NAID 10029795148

手術術後長母指屈筋腱損傷予防を目的としたintermediate fibrous zoneでの方形回内筋切離による橈骨遠位端骨折掌側プレート固定

善財慶治,岡部聡,村田高 [他]
整形・災害外科 53(9), 1099-1104, 2010-08-00
NAID 40017250057

方形回内筋を温存した掌側ロッキングプレートによる橈骨遠位端骨折の治療 : 前向き研究

戸部正博,水谷一裕,大谷崇裕,柳原泰
日本手外科学会雑誌 = The journal of Japanese Society for Surgery of the Hand 26(4), 242-244, 2010-07-14
NAID 10026926290

「方形回内筋」

Pronator quadratus muscle
	Anterior view of left forearm. Deep muscles. (Pronator quadratus visible at bottom-center right.)
Details
Latin	Musculus pronator quadratus
Origin	medial, anterior surface of the ulna
Insertion	lateral, anterior surface of the radius
Artery	anterior interosseous artery
Nerve	median nerve (anterior interosseous nerve)
Actions	pronates the forearm
Antagonist	Supinator muscle
Identifiers
Gray's	p.449
Dorlands; /Elsevier	m_22/12550251
TA	A04.6.02.038
FMA	FMA:38453
	Anatomical terms of muscle