What is the origin of the brachioradialis?

• A. Lateral supracondylar ridge of humerus
• B. Medial supracondylar ridge
• C. Lateral epicondyle
• D. Deltoid tuberosity

Answer: (A)

The main idea is knowing where the brachioradialis starts on the humerus. It originates from the lateral supracondylar ridge of the humerus, the bony ridge on the outer aspect near the elbow. That placement explains its line of pull down to the radius and its primary action of elbow flexion, especially when the forearm is in a neutral position.

This origin is distinct from the other options: the medial supracondylar region isn’t where brachioradialis starts, the lateral epicondyle is the usual starting point for many of the forearm extensors, and the deltoid tuberosity belongs to the deltoid muscle.