The origin of the triceps brachii includes which of the following?

• A. Olecranon process of the ulna
• B. Coracoid process
• C. Infraglenoid tubercle of scapula, proximal and distal half of humerus
• D. Greater tubercle of the humerus

Answer: (C)

Understanding where the triceps brachii attaches at the start helps you see why this option fits. The triceps has three heads: the long head comes from the infraglenoid tubercle of the scapula, while the other two originate on the posterior surface of the humerus—one from the proximal portion and one from the distal portion. Putting those origins together, you get the infraglenoid tubercle plus the proximal and distal halves of the humerus. That matches the description given. The olecranon is where the muscle inserts, not where it originates, so that option isn’t about origin. The coracoid process and greater tubercle are associated with other muscles, not the triceps.