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Sunday September 7, 2008
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Muscles of the Upper Extremity / Triceps Brachii
Page: 1
| 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 and C8) |
Arterial
Supply |
Branches of deep brachial artery | |
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