Which of the following is not included in the thoracic cage?

• A. Thoracic vertebrae
• B. Sternum
• C. Clavicle
• D. Ribs

Answer: (C)

Verified step by step guidance

1. Understand the components of the thoracic cage: The thoracic cage is primarily composed of the thoracic vertebrae, the sternum, and the ribs. These structures form a protective cage around the heart and lungs.
2. Identify the role of the thoracic vertebrae: The thoracic vertebrae are part of the spine and provide attachment points for the ribs, forming the posterior part of the thoracic cage.
3. Recognize the function of the sternum: The sternum, or breastbone, is located in the center of the chest and connects to the ribs via costal cartilages, forming the anterior part of the thoracic cage.
4. Understand the role of the ribs: The ribs are curved bones that form the lateral sides of the thoracic cage, protecting the thoracic organs.
5. Identify the clavicle's location and function: The clavicle, or collarbone, is not part of the thoracic cage. It is located above the first rib and serves as a strut between the shoulder blade and the sternum, playing a role in shoulder movement and stability.