What is cortical bone?

• A. The soft tissue within bone marrow
• B. The lightweight, spongy bone within vertebrae
• C. The dense outer surface of bone that forms a protective layer
• D. The inner, less dense part of bone

Answer: (C)

Cortical bone refers to the dense outer surface of bone that creates a strong protective layer. This type of bone is characterized by its compact structure, making it much denser and sturdier than other types of bone tissue. Cortical bone plays a crucial role in providing strength and support to the skeletal system, as it forms the outer shell of most bones, which helps to bear weight and withstand stress during physical activities. Its density also contributes to the bone's overall strength and ability to protect vital structures like the bone marrow and internal organs.

Understanding cortical bone is essential in bone densitometry, as it significantly impacts bone health assessments and the risk of fractures. This knowledge helps practitioners identify areas where bone density may be low and create effective treatment plans for conditions such as osteoporosis.