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The Elbow and Radioulnar Joints
Anatomy and Physiology of Human Movement 420:050
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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
From Seeley RR, Stephens TD, Tate P: Anatomy & physiology, ed 7, New York, 2006, McGraw-Hill; Shier D, Butler J, Lewis R: hole’s human anatomy & physiology, ed 9, New York, 2002, McGraw-Hill. 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: Extension:
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 Supination
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
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