supinator & pronator arm muscles

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Nia

Cards (3)

  • Pronator Teres:
    O: Humeral: medial supracondylar ridge (lower aspect) & adjacent intermuscular septum and common flexor tendon (CFT) on medial epicondyle
    Ulnar: pronator ridge inferior to coronoid process on ulna
    R: Laterally and downwards
    I: Middle of lateral surface of radius (flattened oval area)
    A: Pronation of forearm, weak flexor of elbow
    NS: Median nerve (C5,6,7, 8,T1)
  • Pronator Quadratus:
    O: Lower 1/4 anterior surface of ulna
    R: Transversely
    I: Lower 1/4 anterior surface of radius, some deeper fibres insert into triangular area above ulnar notch of radius
    A: Initiates forearm pronation, stabilises inferior radio-ulnar joint
    NS: Median nerve (C5,6,7, 8,T1)
  • Supinator:
    O: • Inferior aspect of lateral epicondyle of humerus
    Radial collateral ligament and annular ligament
    Supinator crest of ulna
    R: Downwards & laterally
    I: Upper 1/3 radius on posterior, lateral & anterior aspects of radius (to the attachment of pronator teres)
    A: Supination (anterolateral swing of distal end of radius around the ulna – nonpowerful)
    NS: Radial nerve (C5,6,7,8,T1)