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HEALTH SCIENCES 365 Chapter 6 – Elbow & Radioulnar Joints Bones of the Elbow & Radioulnar Joints Humerus Radius Head Neck Radial Tuberosity Ulnar Notch Styloid Process Ulna Olecranon Process Coronoid Process Semilunar Notch Radial Notch Ulnar Tuberosity Supinator Crest Supinator Fossa Interosseous Crest Head Styloid Process Lateral View – proximal ulna Elbow Joint Humeroulnar Joint (ginglymus) Radioulnar Joint (trochoidial) prox & dist Ulnar collateral ligament Annular ligament _______________________________ ______________________________ Radiohumeral Joint (arthrodial) Radial collateral ligament _______________________________ Interosseous membrane ______________________________ Movements & Range of Motion Humeroulnar joint Radioulnar Joint Flexion: 150° Supination: 90° from neutral position Extension (hyperextension): 10° Pronation: 90° from neutral position Movements of the Elbow & Radioulnar Joints Flexion - movement of the forearm to the shoulder by bending the elbow to decrease its angle Extension - movement of the forearm away from the shoulder by straightening the elbow to increase its angle Supination - external rotary movement of the radius on the ulna that results in the hand moving from the palm-down to the palm-up position Pronation - internal rotary movement of the radius on the ulna that results in the hand moving from the palmup to the palm-down position Myotome & Cutaneous Distribution of Axillary & Musculocutaneous Nerves Elbow Deviations a. Normal Cubitus: 0° - 15° (Carrying Angle) Anatomical position b. Cubitus Varus: Forearm ________________ deviation c. Cubitus Valgus: Forearm ________________ deviation d. Cubitus Recurvatum: Forearm ________________ deviation Muscles of the Elbow & Radioulnar Joint Biceps Brachii O. Long Head: Supraglenoid tubercle Short Head: Coracoid process I. Radial tuberosity & bicipital aponeurosis A. _________________________________________________________ _________________________________________________________ N. Musculocutaneous Brachialis O. Distal half of anterior shaft of humerus I. Coronoid process A. _________________________________________________________ _________________________________________________________ N. Musculocutaneous Brachioradialis O. Lateral supercondylar ridge of humerus I. Styloid process of radius A. _________________________________________________________ _________________________________________________________ N. Radial Triceps Brachii O. Long Head: Infraglenoid tubercle of humerus Lateral Head: Upper half of posterolateral surface of humerus Medial Head: Lower half of posterior surface of humerus I. Olecranon process of ulna A. _________________________________________________________ _________________________________________________________ N. Radial Anconeus O. Posterior surface of lateral condyle of humerus I. Posterolateral surface of olecranon process and upper posterior ulna A. _________________________________________________________ _________________________________________________________ N. Radial Pronator Teres O. Medial supracondylar ridge of humerus & medial side proximal ulna I. Middle third of lateral surface of radius A. _________________________________________________________ _________________________________________________________ N. Median Pronator Quadratus O. Distal fourth of anterior surface of ulna I. Distal fourth of anterior surface of radius A. _________________________________________________________ _________________________________________________________ N. Median Supinator O. Lateral epicondyle of humerus & supinator crest on posterolateral ulna I. Lateral surface of proximal radius just below radial head A. _________________________________________________________ _________________________________________________________ N. Radial Medial Epicondylitis: MOI: Test: Rx: Injuries to the Elbow Lateral Epicondylitis MOI: Test: Rx Subluxation & Dislocation of the Radial Head (Pulled Elbow) MOI: Position: Rx: Subcutaneous Olecranon Bursitis MOI: Rx: