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Table of Contents > Health Dictionary > Triceps brachii

Triceps brachii

Three-headed muscle of posterior (extensor) compartment of arm; origin, long or scapular head: lateral border of scapula below glenoid fossa, lateral head: lateral and posterior surface of humerus below greater tubercle, medial head: posterior surface of humerus below radial groove; insertion, olecranon of ulna; action, extends elbow; nerve supply, radial.
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