Which groove gives attachment to the muscle under the clavicle?

• A. Interosseous Membrane
• B. Supraacetabular Groove
• C. Malleolar
• D. Subclavian Groove

Answer: (D)

The question hinges on identifying where the muscle under the clavicle attaches. The subclavius muscle lies beneath the clavicle and anchors to a groove on the inferior (under) surface of the clavicle. This specific groove is called the groove for subclavius, also known as the subclavian groove. It provides the attachment site for the muscle as it runs from the first rib and costal cartilage upward to the clavicle, helping depress and stabilize the shoulder.

The other terms refer to structures unrelated to the clavicle’s muscle attachments: the interosseous membrane sits between forearm bones, the supraacetabular groove is near the hip, and the malleolar region pertains to the ankle.