Pronator quadratus
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| Pronator quadratus | |
|---|---|
| Front of the left forearm. Deep muscles. (Pronator quadratus visible at bottom-center right.) | |
| Latin | musculus pronator quadratus |
| Gray's | subject #125 449 |
| Origin | medial, anterior surface of the ulna |
| Insertion | lateral, anterior surface of the radius |
| Artery: | anterior interosseous artery |
| Nerve: | median nerve (anterior interosseous nerve) |
| Action: | pronates the forearm |
| Antagonist: | Supinator muscle |
| Dorlands /Elsevier | m_22/12550251 |
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. Arterial blood comes via the interosseous artery.
Contents |
Origin and insertion
Its fibres 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.
Action
When pronator quadratus contracts, it pulls the lateral side of the radius towards the ulna, thus pronating the hand. It also helps to keep the two bones in the forearm bound together.
Additional images
 Bones of left forearm. Anterior aspect. |
 Transverse section across distal ends of radius and ulna. |
 Deep palmar nerves. |
External links
- 114294862 at GPnotebook
- UWASH pronatorquadratus
- Pronator+quadratus+muscle at eMedicine Dictionary
 | This muscle article is a stub. You can help WikiDoc by expanding it. |
de:Musculus pronator quadratusfr:Muscle carré pronateur hu:Négyszögű csavaró izom ja:方形回内筋sv:Pronator quadratus
