Final answer:
The thoracic cage consists of twelve pairs of ribs, categorized into true, false, and floating ribs. These ribs form a protective and supportive structure around the thoracic organs, such as the heart and lungs, facilitating respiratory functions and safeguarding vital organs.
Step-by-step explanation:
The thoracic cage, also known as the rib cage, consists of twelve pairs of ribs, contributing to the protective framework of the thoracic region. These ribs are categorized into three types: true ribs (the first seven pairs), false ribs (pairs eight to twelve), and floating ribs (eleventh and twelfth pairs). The true ribs connect directly to the sternum via costal cartilage, while the false ribs connect either indirectly or not at all. The floating ribs lack a direct connection to the sternum, providing flexibility to the lower thoracic region. This intricate arrangement of ribs safeguards vital organs within the thoracic cavity, including the heart and lungs, while also supporting respiratory functions. The thoracic cage serves a dual purpose, providing protection and structural support for the thoracic organs, as well as accommodating the dynamic movements associated with breathing.