Which bones are classified as irregular bones?

Irregular bones are classified based on their unique shapes and structures that do not fit into the other categories of bones like long, short, or flat bones. The vertebrae and facial bones are prime examples of irregular bones due to their complex shapes that serve specific functionalities.

The vertebrae are an essential part of the spinal column, providing support and structure while also protecting the spinal cord. Their irregular shape allows for flexibility and mobility of the back. Similarly, the bones of the face, such as the nasal bones, maxilla, and mandible, exhibit complex forms that facilitate various functions, including the structure of the facial appearance, chewing, and housing sensory organs.

Other choices do not accurately represent irregular bones. For instance, the skull comprises flat and irregular bones, and while the arms, ribs, pelvis, legs, and forearms have their roles and classifications, they do not exhibit the unique characteristics that categorize them as irregular bones. Understanding these distinctions helps in identifying the various types of bones based on their structural properties and functions in the body.