No, the sternum is not classified as an irregular bone. Instead, it is categorized as a flat bone.
The sternum, commonly known as the breastbone, is a long, flat bone located in the center of the chest. It plays a crucial role in protecting vital organs, such as the heart and lungs, and serves as an attachment point for ribs and certain muscles.
Flat bones, including the sternum, typically have a thin, flattened shape, which allows for both protection and the ability to provide a broad surface area for muscle attachment. In contrast, irregular bones have complex shapes that do not fit into the other categories (long, short, or flat) and are often found in the spine or pelvic area.
In summary, while the sternum may have some unique features, it is primarily categorized as a flat bone rather than an irregular bone.