And that means the human skeletal system only contains five different types of bones. So let's discuss what these five different groups are, are what these five different types of bones are. Let's discuss their function and then let's take a look at the following diagram and let's place some of these bones into their correct group. So let's begin with the long bone. The long bone is called the long bone because they're much longer than they are wide. And the long bone consists of three different sections.