Name the structures forming the superior thoracic aperture and explain why they matter clinically.

Name the structures forming the superior thoracic aperture and explain why they matter clinically.

• A. Clavicles and sternum form the aperture; they prevent compression of great vessels.
• B. The last cervical vertebra, first rib, and clavicle form the aperture; they separate the thoracic cavity from the abdomen.
• C. The first thoracic vertebra (T1), the first pair of ribs, and the manubrium form the superior thoracic aperture; they are borders through which vascular and neural structures pass between neck and thorax, with potential compression in thoracic outlet syndromes.
• D. The second thoracic vertebra (T2), second pair of ribs, and the body of the sternum form the aperture; they define the expansion of the thoracic cavity.

Answer: (C)