Which of the following is not considered to be a flat bone?

Flat bones are characterized by their thin and flattened shapes, serving various protective and structural roles in the body. The scapula, ribs, and sternum all exemplify flat bones—each provides support and protection for vital organs while offering attachment points for muscles.

Vertebrae, on the other hand, do not fit this classification. They are classified as irregular bones due to their complex, varied shapes that do not conform to the flat, thin structure typical of flat bones. Irregular bones serve specific functions, such as providing protection for the spinal cord and supporting the body in different postures.

Understanding these classifications is important for recognizing the diverse functions and structures within the skeletal system.