FOREARM MUSCLE INNERVATION AND ACTION

supination and pronation

nerve: biceps brachii

muculocutaneous nerve

nerve: supinator

radial nerve

nerve: pronator teres

median nerve

nerve: pronator quadratus

anterior interosseous nerve

nerve: bracioradialis

radial nerve

action: biceps brachii

supinator (elbow flexion)

action: supinator

adequate supination

supplies adequate supination of supinator during:

1. slow supination

2. elbow extension

3. light resistance

4. low power

action: pronator teres

pronator (shoulder flexion)

strongest pronator muscle during elbow flexion

pronator teres

stronger supinator during elbow flexion

biceps brachii

Pronator quadratus

pronation prime mover

can still pronate even if elbow extends

pronator quadratus

action: brachioradialis

pronates until midprone position (unnafected by shoulder position)