Which of the following bones is NOT considered a long bone?

• A. Phalanges
• B. Tibia
• C. Femur
• D. Scapula

Answer: (D)

The scapula is classified as a flat bone, rather than a long bone. Long bones are characterized by having a greater length than width and include structures that typically function in the support of weight and the facilitation of movement. They consist of a diaphysis (shaft) and epiphyses (ends) and are primarily composed of compact bone with a central medullary cavity.

In contrast, the scapula, also known as the shoulder blade, is designed primarily for protecting the underlying structures of the upper back and providing an attachment point for muscles that facilitate arm movement. It is structured differently from long bones, as it is broad and flat with a superficial surface that allows for muscle attachment, rather than the elongated structure typical of long bones such as the phalanges, tibia, and femur. This specific morphology supports its role in stability and mobility rather than load-bearing.