Elbow and Radioulnar Joint Muscles

• Elbows Flexors:

  A) Brachialis

  B) Brachioradialis

  C) Biceps brachii

  D) Pronator teres

  
• Elbow Extensor:

  A) Triceps brachii

  B) Anconeus

  
• Radioulnar Supinators:

  A) Biceps brachii

  B) Supinator

  C) Brachioradialis

  
• Radioulnar Pronators:

  A) Pronator teres

  B) Pronator quadratus

  C) Brachioradialis

  
• Compartments of the arm:

  
• Mechanical Position of Elbow:

  • Supinator, biceps brachii & brachioradialis are all supinator muscles
  • Biceps brachii will be activated for powerful supinator functions
  • However, biceps brachii cannot supinate if the elbow is in extension
  • Therefore, powerful supination movements are carried out with the elbow flexed to about 120°