The sternum is classified as which type of bone?

The sternum is classified as a flat bone because of its thin and plate-like structure. Flat bones are characterized by their broad surfaces, which provide protection for underlying internal organs and serve as sites for muscle attachments. The sternum, located in the center of the chest, serves to protect the heart and lungs, and its flat shape allows for the attachment of the ribs through cartilage, forming the rib cage. This classification of the sternum as a flat bone is supported by its anatomy and function in the human body.

In contrast, long bones like the femur and humerus are characterized by their length and are primarily involved in movement and weight-bearing. Irregular bones have complex shapes that do not fit into the other categories and provide various functions, such as support and protection. Sesamoid bones, such as the kneecap, develop within tendons and help to protect the tendons from stress and wear. The distinct characteristics and supportive role of the sternum align it with the classification of flat bones.