Muscle Atlas

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 and C8)
Arterial Supply: Branches of deep brachial artery

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