In human anatomy, what is the insertion of the brachioradialis muscle?

• A. Styloid process of the radius (lateral distal radius)
• B. Olecranon process of the ulna
• C. Ulnar tuberosity and coronoid process of the ulna
• D. Radial tuberosity

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the terminology. In anatomy, the 'insertion' of a muscle refers to the point where the muscle attaches to the bone that moves when the muscle contracts. It is usually located distal to the origin.
2. Step 2: Identify the brachioradialis muscle's general location. It is a muscle of the forearm that helps flex the elbow, and it runs along the lateral side of the forearm.
3. Step 3: Recall the origin of the brachioradialis, which is the lateral supracondylar ridge of the humerus. This helps to confirm the direction of the muscle fibers toward the forearm bones.
4. Step 4: Determine the insertion point by considering which bone and specific part the brachioradialis attaches to on the distal forearm to facilitate elbow flexion. The insertion is on the radius, specifically on a bony prominence near the wrist.
5. Step 5: Match the anatomical terms given in the options to the known insertion site. The styloid process of the radius is a lateral distal projection on the radius bone, making it the correct insertion point for the brachioradialis muscle.