Irregular bones are a category of bones that do not fit into the standard classifications of long, short, or flat bones. They have complex shapes that serve specific functions in the body. Examples of irregular bones include the vertebrae, which support the spine, and the pelvis, which protects internal organs. These bones are typically made up of a mix of compact and spongy bone tissue, providing strength and flexibility. Their unique shapes allow for various attachments of muscles and ligaments, contributing to the overall movement and stability of the skeleton.