Supinator - Muscle Physiology & Functional Anatomy

 

Supinator Muscle

Anatomy

 

Origin:

  • Deep fibers (horizontal)

    • Supinator crest and fossa of ulna

  • Superficial fibers (downwards)

    •   Lateral epicondyle and lateral ligament of elbow and annular ligament

Insertion

  • Lateral proximal radial shaft (neck & shaft of radius, between anterior & posterior oblique lines)



Major Arteries:

  • Radial recurrent artery

 

Neural Innervation:

  • Deep branch of radial nerve (posterior interosseous nerve (C5, C6)

 

Trigger Points: 

Supinator Trigger Points

 

Physiology

 

Concentric Functions:

  • Assists forearm supination (only acts alone when elbow is fully extended)

Eccentric Functions:

  • Decelerates forearm pronation

Isometric Function:


Related Muscles


Antagonist:

Exercises:

 

 


More Images of the Supinator Muscle

Supinator MuscleSupinator Muscle


More Information about the Supinator Muscle

The supinator muscle assists the biceps brachii when the arm is in any position except for fully extended.  When the elbow is fully extended, the supinator muscle acts alone to supinate the forearm.

 

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