The Elbow and Radioulnar Joints

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The Elbow and Radioulnar Joints

• Anatomy and Physiology of Human Movement
• 420050

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The Elbow and Radioulnar Joints

• Usually grouped together due to close anatomical
  relationship
• Elbow joint movements may be clearly
  distinguished from those of the radioulnar joints
• Often grouped together due to proximity
• Entirely different
• Structurally 2, functionally 1
• Elbow joint distal attachment
• Ulna
• Radioulnar joint distal attachment
• Radius

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Objectives

• Bones, bony landmarks and joints
• Muscles
• Movements

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The Elbow and Radioulnar Joints

• Elbow Joint
• Diarthrodial uniaxial hinge joint
• Plane?
• Axis?
• Movements?
• Articulation?
• Bony Stops?

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Radioulnar Joint

• Radioulnar Joint
• Diarthrodial uniaxial pivot joint
• Plane?
• Axis?
• Movements?
• Articulations?

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Objectives

• Bones, bony landmarks and joint
• Muscles
• Movements

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Biceps Brachii
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Brachialis
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Brachioradialis
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Triceps Brachii
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Anconeus
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Pronator Teres
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Pronator Quadratus
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Supinator
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Objectives

• Bones, bony landmarks and joint
• Muscles
• Movements

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Movements

• Flexion
• Movement of forearm to shoulder by bending the
  elbow to decrease its angle Extension
• Extension
• Movement of forearm away from shoulder by
  straightening the elbow to increase its angle

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Movements

• Pronation
• Internal rotary movement of radius on ulna that
  results in hand moving from palm-up to palm-down
  position
• Supination
• External rotary movement of radius on ulna that
  results in hand moving from palm-down to palm-up
  position

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FLEXION

• Superior movement of the forearm in the sagittal
  plane

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FLEXION
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FLEXION

• Biceps brachii
• Brachialis
• Brachioradialis
• Pronator teres

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EXTENSION

• Inferior movement of the foremarm in the sagittal
  plane

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EXTENSION
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EXTENSION

• Triceps
• Long head also extends the shoulder
• Anconeus

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PRONATION

• Internal rotary movement of the palm to the down
  position

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Pronator Quadratus
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PRONATION
Supinated position
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PRONATION

• Brachioradialis
• Pronator teres
• Pronator quadratus

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SUPINATION

• External rotary movement of the palm to the up
  position

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Supinator
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SUPINATION
Supinated position
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SUPINATION
Pronated position
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SUPINATION

• Biceps brachii
• Brachioradialis
• Supinator