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The Elbow and Radioulnar Joints. Anatomy and Kinesiology 420:024. 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
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The Elbow and Radioulnar Joints Anatomy and Kinesiology 420:024
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