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Triceps Brachii
Origin: 1. Long head: infraglenoid tubercle of scapula
2. Lateral head: posterior humerus above spiral groove
3. Medial head: posterior humerus below spiral groove
Insertion: Olecranon process of ulna
Action: Extension of elbow
Long head: extension of humerus
Nerve: Radial Nerve (Cervical 7, 8)
Palpate: Posterior and lateral surface of humerus during active elbow extension.
Triceps means three heads (Latin). It is the only muscle on the posterior arm. The long head of the triceps originates from the infraglenoid tubercle, whereas the long head of the biceps originates from the supraglenoid tubercle.
