Muscles on the Posterior Surface of the Arm

Muscles on the Posterior Surface of the Arm - Anconeus...

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Muscles on the Posterior Surface of the Arm MUSCLE FROM TO ACTION Triceps Brachii long head - infra glenoid tuberosity lateral head - posterior surface of upper half of humerus medial head - posterior surface of lower 2/3 of humerus olecranon process of ulna The long head crosses the shoulder and therefore acts in shoulder extension; primarily acts in elbow extension (strong); has a large physiological cross-section and a favorable angle of pull; it is a spurt muscle so has a greater rotary component
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Unformatted text preview: Anconeus posterior surface of the lateral epicondyle of humerus lateral side of olecranon process and posterior surface of upper part of ulna Acts to extend the elbow - it initiates extension and it helps to maintain the extended position; it also stabilizes the elbow during other movements Supinator lateral condyle of humerus, adjacent portion of ulna, radial collateral and annular ligaments lateral surface of upper 1/3 of radius Acts in supination of the forearm...
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Muscles on the Posterior Surface of the Arm - Anconeus...

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