The supinator is not a large forearm muscle, but it’s one of the muscles responsible for twisting motions at the wrist. This movement is essential for anyone opening a bottle of wine, using a screwdriver, or trying to work a doorknob. Here’s more about this useful muscle.
The origin of the supinator is in four spots. The technical names for these areas are the lateral epicondyle of the humerus, radial collateral ligament of the elbow, annular ligament of the radius, and the supinator crest of the ulna. Basically, that translates as the lower, outside part of the humerus; a nearby elbow ligament; a ligament near the radius; and a line on the shaft of the ulna.
The insertion for the supinator is in a line on the top third of the radius. This line is along the outside edge but still on the top of the bone. To use technical lingo, it’s on a line on the lateral anterior surface of the upper third of the radius.
As you might guess, the supinator supinates the forearm. This means that it turns your palm to face the ceiling. Although your supinator works whether your arm is bent or straight, I think it’s best to stabilize your bent elbow by your side and rotate to ensure that your rotation comes from the elbow and not from the shoulder.
Commonly, the supinator is used when you use a screwdriver or turn a door handle.
For some people, the supinator may be a cause of tennis elbow pain. Also, if you notice that you can rotate one palm toward the ceiling very well but not the other, that would be a sign of supinator weakness or dysfunction.
Restoring or Maintaining Health
If you feel like you may have injured your supinator, contact your doctor. He or she can order the appropriate imaging, medicine, and therapy necessary for a smooth recovery.
For anyone who is wanting to maintain the strength and flexibility of this muscle, I have some suggestions. To strengthen your supinator, practice Mountain pose with your arms by your sides, Boat pose, and Locust pose. Take the time to really find the rotation from your elbows. Again, make sure that you’re not cheating and rotating at your shoulders.
Again, thanks to KnowYourBody.net for the wonderful image.
I consulted [easyazon_link identifier=”1623170206″ locale=”US” tag=”custpilandyog-20″]The Concise Book of Muscles[/easyazon_link] by Chris Jarmey. Recently, the book was revised and is in its third edition. I love this book as a quick go-to guide for easy to understand anatomy.
For those who are more interested in technical terminology and smaller muscles, I recommend [easyazon_link identifier=”1878576003″ locale=”US” tag=”custpilandyog-20″]Flash Anatomy Muscles Flash Cards[/easyazon_link]. Any time a client comes to me with pain, I use these flash cards.
What’s your favorite way to strengthen or stretch your supinator? Let us know in the comments below.
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