Elbow Functions Essay

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CHAPTER 5 STRUCTURE AND FUNCTION OF THE ELBOW AND FOREARM COMPLEX The forearm complex allows movements of pronation and supination motions that rotate the palm upward or downward. The forearm consists of two articulations: the proximal and distal radioulnar joint. Joints of the elbow and forearm complex 1. Humeroulnar joint 2. Humeroradial joint 3. Proximal radioulnar joint 4. Distal radioulnar joint The four bones that relate to the function of the elbow and forearm complex 1. Scapula 2. Distal humerus 3. Ulna 4. Radius Scapula Scapula has three boney features that are important to the muscles of the elbow 1. Coracoid process-serves as the proximal attachment for the short head of the biceps 2. Supraglenoid tubercle- serves as the proximal attachment for the long head of the biceps 3. Infraglenoid tubercle- marks the proximal attachment for the long head of the triceps Distal Humerus 1. Trochlea- spool shaped structure located on the medial side of the distal humerus that articulates with the ulna to form the humeroulnar joint 2. Coronoid fossa- a small pit located just superior to the trochlea that accepts the coronoid process of the ulna when the elbow is fully flexed. 3. Capitulum- just lateral to the trochlea, articulates with the head of the radius to form the humeroradial joint 4. Medial epicondyle- the prominate projection of bone on the medial side of the distal humerus. This easily palpable prominence serves as the proximal attachment for most of the wrist flexor muscles, the pronator teres, and the collateral ligament of the elbow 5. Lateral epicondyle- less prominent, proximal attachment for most wrist extensor muscles, the supinator muscle, and lateral collateral ligament of the elbow. Immediately proximal to both epicondyles are the medial and lateral supracondylar ridges. 6. Olecranon fossa- is the relatively deep, broad

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