Extremities Exam 1 – Muscles Practice

The insertion of the triceps brachii is which of the following?

Intertubercular groove Olecranon process of ulna Greater tubercle of humerus Radial tuberosity

Correct Answer:

Olecranon process of ulna

Explanation:

The key idea is where the muscle attaches to bone and how that supports its action. The triceps brachii inserts at the olecranon process of the ulna, which is the bony prominence at the tip of the elbow. When the triceps contracts, it pulls on the olecranon to extend the elbow, straightening the forearm. Why this site fits best: the olecranon serves as the leverage point for elbow extension, making it the natural insertion for an elbow extensor like the triceps. The other sites correspond to different muscles or actions (for example, the intertubercular groove is a humeral groove associated with the biceps and other muscles, the greater tubercle is a rotator cuff/fixed shoulder region, and the radial tuberosity is the insertion for the biceps on the radius).

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