Which radius landmark serves as the attachment site for the brachioradialis?

• A. Styloid process of the radius
• B. Radial tuberosity
• C. Head of radius
• D. Dorsal tubercle

Answer: (A)

The main idea is where the brachioradialis attaches to the radius. The brachioradialis tendon runs to the distal end of the radius and inserts at the styloid process on the lateral (thumb) side. This distal radius landmark is where the muscle anchors, which aligns with its role in elbow flexion when the forearm is in a midpronated position.

The radial tuberosity, by contrast, is the insertion site for the biceps brachii, located more proximally on the medial aspect of the radius. The head of the radius is the proximal end near the elbow joint and isn’t the attachment for this muscle. The dorsal tubercle (Lister’s tubercle) is a dorsal distal radius feature used as a pulley for certain extensor tendons, not for brachioradialis.