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How do bones protect organs such as the brain, heart, and lungs?
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bone
A long bone of the human body, showing a magnified cross section of the interior.
Bones provide essential protection for vital organs through specialized structures within the axial skeleton.
- The Brain: The brain is encased and shielded by the cranium, which forms the upper portion of the skull.123
- The Heart and Lungs: These organs are protected by the rib cage, a basketlike structure composed of the ribs, sternum, and thoracic vertebrae. Because the heart and lungs require space for motion, expansion, and contraction, the rib cage is designed to be semirigid yet flexible. This elasticity is facilitated by costal cartilages that connect the ribs to the sternum, as well as small joints that allow for gliding motion during breathing.142
Additionally, the spinal cord is protected by the vertebral column through bony neural arches that encircle the cord, supported by intervening ligaments.12