What is a major role of irregular bones?

Irregular bones play a significant role primarily in protecting internal organs. These bones, which have complex shapes that do not fit into the typical categories of long, short, or flat bones, are specifically designed to provide the necessary protection for vital structures in the body. A prime example of irregular bones includes the vertebrae, which shield the spinal cord, and the pelvis, which encases reproductive organs and the lower gastrointestinal tract.

The unique shapes of irregular bones allow them to fulfill various other roles, such as providing support and stability or serving as anchor points for muscle attachment. However, the protection of internal organs is a defining characteristic of irregular bones.