Which bones are typically classified as irregular bones?

Irregular bones are characterized by their complex shapes that do not fit neatly into the standard categories of long, short, or flat bones. The vertebrae are classified as irregular bones because they possess unique shapes that allow them to provide structure, support, and protection for the spinal cord while also enabling a range of movements. Their irregular structure accommodates the various attachments for muscles and ligaments, which is essential for spinal stability and mobility.

Carpals, scapulae, and femur bones do not fall into this category. Carpals are categorized as short bones because they are approximately as wide as they are long. The scapula, while somewhat irregular in shape, is considered a flat bone due to its thin, flattened structure that contributes to its role in shoulder mechanics. The femur is classified as a long bone, known for its elongated shape that supports weight and facilitates movement in the legs. Thus, the distinct characteristics of vertebrae confirm their classification as irregular bones.