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The thoracic cage of man is formed of...

The thoracic cage of man is formed of

A

Ribs and sternum

B

Ribs, sternum and thoracic vertebrae

C

Ribs , sternum, and lumbar vertebrae

D

Ribs and thoracic vertebrae

Text Solution

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The correct Answer is:
**Step-by-Step Text Solution:** 1. **Understanding the Thoracic Cage**: The thoracic cage, also known as the thoracic cavity or chest cavity, is a crucial structure in the human body that houses the lungs and plays a significant role in the respiratory system. 2. **Components of the Thoracic Cage**: - **Dorsal Side**: The thoracic cage is bounded dorsally by the vertebral column, which consists of vertebrae. Specifically, the thoracic portion of the vertebral column contains 12 thoracic vertebrae. - **Ventral Side**: Anteriorly, the thoracic cage is formed by the sternum, commonly referred to as the breastbone. - **Lateral Side**: On the sides, the thoracic cage is made up of ribs, which are thin, flat bones that protect the thoracic cavity and assist in the breathing process. 3. **Function of the Thoracic Cage**: The thoracic cage acts as an airtight chamber that allows for the expansion and contraction of the lungs during breathing. By altering the volume of the thoracic cavity, pressure changes are created, facilitating pulmonary ventilation. 4. **Conclusion**: Therefore, the thoracic cage of man is formed by the thoracic vertebrae (dorsally), the sternum (ventrally), and the ribs (laterally). **Final Answer**: The thoracic cage of man is formed of the thoracic vertebrae, sternum, and ribs. ---
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