Updated: 12/26/2021

Triceps Brachii

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  • Summary
    • Triceps Brachii
      Origin
      Long head: infraglenoid tubercle of scapula;
      Lateral head: posterior surface of humerus, superior to radial groove;
      Medial head: posterior surface of humerus, inferior to radial groove
      Insertion
      Proximal end of olecranon process of ulna and fascia of forearm
      Action
      Chief extensor of forearm; long head steadies head of abducted humerus
      Innervation
      Radial nerve (C6, C7, C8)
      Arterial supply
      Branches of deep brachial artery

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