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Medical Term:

triceps brachii (muscle)


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.

Synonym(s): musculus triceps brachiiTA, triceps muscle of arm

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