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Triceps Brachii

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Illustration of the triceps brachii[1]
  • Long Head
    • Infraglenoid tubercle of the Scapula
  • Medial Head
    • Posterior surface of the Humerus (inferior to radial groove)
  • Lateral Head
    • Posterior surface of the Humerus (superior to radial groove)


  • Course
    • Long and lateral heads merge about two thirds of the way down the humerus to form the superficial tendinous insertion
    • The medial head joints the deep surface of the superficial tendinous insertion more distally
    • All 3 heads insert together on the proximal olecranon
  • Insertion onto the Olecranon
    • This is known as the triceps footprint[2]
    • Medially: insertion extends on the posterior end of the ulna
    • Laterally: inserts onto the fascia of the extensor carpi ulnaris


  • All Heads
    • Extension of forearm (at the elbow)
  • Long Head
    • Extension and Adduction of the arm (at the shoulder)

Vascular Supply

  • Deep Brachial Artery


  • Radial Nerve (C7-C8)

Clinical Significance

See Also


  1. Malanga, Gerard, and Kenneth Mautner. Atlas of ultrasound-guided musculoskeletal injections. McGraw-Hill, 2014.
  2. Yeh PC, Dodds SD, Smart LR, et al. Distal triceps rupture. J Am Acad Orthop Surg. 2010;18:31–40.
Created by:
Chris Hauglid on 7 July 2020 17:00:06
Last edited:
30 October 2023 22:35:14