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Humeroulnar Joint (Elbow) Presented by Joy and Misty Anterior Surface Anatomy Cubital Fossa Medial Bicipital line Posterior Surface Anatomy Lateral Epicondyle • Hinge joint- simple joint where the articulating surfaces allow for motion in only one direction •Pivot Joint- allows one bone to rotate around another bone Synovial joint- capsule that contains synovial fluid which nourishes articular cartilage and lubricating the articulating surfaces. Synovial joints are usually reinforced by accessory ligaments Ligaments • A ligament is a strip or sheet of tough collagenous connective tissue that attaches a muscle to a bone. Bursa- A fibrous sac filled with synovial fluid located between adjacent muscles or where a tendon passes over a bone Trochlear Notch Ulnar Tuberosity Muscles of Extension •Triceps brachii Long head Infraglenoid tubercle of the scapula O Lateral head Inferior to greater Tubercle on posterior humerus O O Medial head Posterior surface of humerus Radial nerve Deep Brachial artery I All headsOlecranon process of Ulna Muscles of Flexion Supraglenoid tubercle O lateral supracondylar ridge of humerus O- Long Head O- short head Coracoid process scapula Brachioradialis Biceps Distal half of humerus anterior surface I- both O Radial nerve Radial artery Brachialis Musculocutaneous nerve Brachial artery I- styliod process radius Radial tuberosity I Coronoid process and ulnar tuberosity Muscles of Pronation Pronator quadratus Distal fourth of Ulna Median nerve Ulnar artery O I Distal fourth Of radius O Medial epicondyle of Humerus And corinoid process of Ulna O Pronator teres (also assists in elbow flexion) I Lateral aspect of radius at its midpoint Median nerve Anterior interosseous artery Muscles of Supination Supinator Lateral Epicondyle of Humerus and adjacent Ulna O O Radial nerve Interosseous artery Biceps I Anterior surface of the proximal radius ( wraps around ) I Radial tuberosity of radius Arteries Veins Nerves Clinical Concerns