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The Elbow and Radioulnar Joints. Anatomy and Physiology of Human Movement 420:050. 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
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The Elbow and Radioulnar Joints Anatomy and Physiology of Human Movement 420:050
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
Objectives • Bones, bony landmarks and joints • Muscles • Movements
The Elbow and Radioulnar Joints • Elbow Joint • Diarthrodial uniaxial hinge joint • Plane? • Axis? • Movements? • Articulation? • Bony Stops?
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 • Radioulnar Joint • Diarthrodial uniaxial pivot joint • Plane? • Axis? • Movements? • Articulations?
Objectives • Bones, bony landmarks and joint • Muscles • Movements
Objectives • Bones, bony landmarks and joint • Muscles • Movements
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
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
FLEXION • Superior movement of the forearm in the sagittal plane
FLEXION • Biceps brachii • Brachialis • Brachioradialis • Pronator teres
EXTENSION • Inferior movement of the foremarm in the sagittal plane
EXTENSION • Triceps • Long head also extends the shoulder • Anconeus
PRONATION • Internal rotary movement of the palm to the down position
PRONATION Supinated position
PRONATION • Brachioradialis • Pronator teres • Pronator quadratus
SUPINATION • External rotary movement of the palm to the up position
SUPINATION Supinated position
SUPINATION Pronated position
SUPINATION • Biceps brachii • Brachioradialis • Supinator