What percentage of the skeletal body's mass is represented by cortical bone?

• A. 70%
• B. 75%
• C. 80%
• D. 85%

Answer: (C)

Cortical bone represents a significant portion of the skeletal body's mass, typically accounting for about 80% of the total bone mass. This type of bone is dense and forms the outer layer of bones, providing strength and protection to the inner, less dense trabecular (cancellous) bone. This structural composition is crucial for supporting the body and protecting internal organs. Understanding the composition of bone is important in bone densitometry, as it helps in assessing bone health and diagnosing conditions like osteoporosis. The high percentage of cortical bone emphasizes its role in overall skeletal strength and function, making it a key component in various clinical assessments and treatments related to bone density.