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Pronator Quadratus

Region

Origin & Insertion

['Origin: Distal anterior surface of ulna', 'Insertion: Distal anterior surface of radius']

Synergistic Muscles

['Pronator teres']

Joints

['Distal radioulnar joint']

Primary Actions

['Forearm pronation (primary)']

Nerve & Spinal Segment

Median nerve (anterior interosseous branch)

Brachial plexus; C8–T1

Interesting

Deepest forearm muscle; most efficient pronator. [Moore's]

Reversal of Action

Stabilize radius while rotating ulna in closed chain

Common Dysfunctions

Loss of distal pronation control

How to Stretch

Passive supination with wrist support.

Trigger Points

How to Strengthen

Isometric and active pronation.

Concentric Action

Pronate forearm near wrist

Applications:

Key for fine motor control and distal radioulnar joint stability

Eccentric Action

Control return from pronation to neutral

Isotonic Action

Wrist pronation with a small lever

Related Conditions

['Distal forearm weakness', 'Tendonitis']

Isometric Action

Hold wrist in neutral against resistance

Exercise Ideas

['Wrist twist bar', 'Resisted forearm turn', 'Hammer twist']

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