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Triceps Brachii
Region: Shoulder & Arm Muscles · All shoulder & arm muscles
Triceps Brachii at a glance
| Origin | Long head: infraglenoid tubercle of the scapula; lateral and medial heads: back of the humerus |
|---|---|
| Insertion | Olecranon process of the ulna |
| Actions | Straightens the elbow (extension); Long head also extends and adducts the arm |
| Nerve supply | Radial nerve (C6–C8) |
◆ Good to know
The only muscle in the back compartment of the arm; its tendon forms the striking surface for the triceps reflex.
More Shoulder & Arm Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.