What is an example of irregular bones?

Irregular bones are those that do not fit into the typical categories of long, short, flat, or sesamoid bones due to their complex shapes. The vertebrae serve as a prime example of irregular bones, as they have a unique structure that supports the spine and protects the spinal cord while allowing for flexibility and movement. Each vertebra is shaped differently to accommodate various functions such as articulating with the ribs and serving as attachment points for muscles and ligaments.

In contrast, the femur and scapula are categorized as a long bone and a flat bone, respectively, and the hock, or tarsus, is formed by several short bones that have a more standardized appearance. The distinct structure of irregular bones like the vertebrae provides crucial support and protection that is specifically tailored to their function in the skeletal system.