Spry Juncture, LLC
How to Evolve Gracefully
Supinator
Region
Origin & Insertion
['Origin: Lateral epicondyle of humerus, supinator crest of ulna', 'Insertion: Lateral, posterior, and anterior surfaces of proximal radius']
Synergistic Muscles
['Biceps brachii']
Joints
['Proximal radioulnar joint']
Primary Actions
['Forearm supination']
Nerve & Spinal Segment
Radial nerve (deep branch)
Brachial plexus; C6–C7
Interesting
Works alone during slow, unresisted supination. [Gray’s Anatomy]
Reversal of Action
Support upper arm ER from distal fixation
Common Dysfunctions
Difficulty turning palm upward, radial tunnel syndrome
How to Stretch
Pronate forearm and flex wrist.
Trigger Points
How to Strengthen
Supination with resistance (slow and controlled).
Concentric Action
Rotate palm upward (supination)
Applications:
Important in unlocking door knobs or using utensils
Eccentric Action
Control return from supination to pronation
Isotonic Action
Band or lever-assisted supination
Related Conditions
['Radial tunnel syndrome', 'Lateral epicondylitis']
Isometric Action
Hold forearm supinated against resistance
Exercise Ideas
['Hammer supination', 'Supination band twist', 'Isometric holds']