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Arm Anatomy

Triceps Brachii Anatomy: Origin, Insertion, Actions

Origin: Long head – Infraglenoid tubercle of the scapula. Lateral head – Posterior and lateral aspect of the humerus. Medial head – Lower posterior surface of the humerus.
Insertion: Posterior surface of the olecranon process of the ulna
Action: Extension of the arm at the elbow, adduction and extension of the arm

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