Which of the following is an example of a flat bone?

Which of the following is an example of a flat bone?

• A. Scapula
• B. Vertebra
• C. Phalanx
• D. Femur

Answer: (A)

The scapula is classified as a flat bone due to its structure and function. Flat bones are typically characterized by their thin, flattened shape and are composed of two layers of compact bone with a layer of spongy bone in between. The scapula, or shoulder blade, serves multiple purposes; it provides a broad surface area for muscle attachment and contributes to the protection of the underlying structures in the thoracic cavity.

In contrast, the vertebra is classified as an irregular bone, which has complex shapes that do not fit into the other categories. Phalanges, which are the bones of the fingers and toes, are categorized as long bones due to their elongated structure, which facilitates movement and support. The femur is also a long bone, being the longest bone in the human body, designed to support weight and enable mobility. Therefore, the unique shape and function of the scapula illustrate why it is correctly identified as a flat bone.