Identify the indicated muscle.

Question

BlackTom AI · Accepted Answer

To determine which muscle is indicated, let’s examine the anatomy and the position shown in the diagram.

Option 1: brachioradialis. This muscle is a long fusiform muscle in the forearm that originates on the lateral supracondylar ridge of the humerus and inserts on the distal radius. It is most prominent on the lateral (thumb-side) forearm, and it flexes the elbow especially when the forearm is in a mid-pronated/supinated position. The arrow in the image points to a slender muscle along the lateral forearm, consistent with the typical location of the brachioradialis.

Option 2: supinator. The supinator is a deeper muscle located on the posterior/lateral aspect of the proximal forearm, wrapping around the radius. It is not as superficially visible in a standard anterior view and would not be the prominent muscle indicated by a superficial arrow on the lateral forearm.

Option 3: biceps brachii. This big anterior arm muscle is located in the upper arm (brachial region) and has a prominent belly near the elbow, but the image shows a forearm muscle rather than the biceps. The biceps brachii would be more proximal and bulky in the arm region, not the slender forearm muscle pointed to by the arrow.

Option 4: pronator teres. This muscle runs from the medial epicondyle of the humerus and coronoid process of the ulna to the radius, located more medially at the proximal forearm. It is relatively small and would not be the main structure highlighted by a marker on the lateral forearm.

Option 5: flexor carpi radialis. This is a superficial muscle on the anterior forearm that runs medially to the radial side and acts to flex the wrist. While it is in the forearm, its course is more medial and anterior toward the wrist, and it does not align with the lateral location suggested by the indicator.

In summary, the indicated muscle aligns best with the typical, superficial, lateral forearm position of the brachioradialis, matching both the anatomical location and the orientation shown in the image.

Identify the indicated muscle.

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