So when our human is born, the skull actually consists of individual bones. But as the organism develops, as the human develops, these bones basically fuse together. And the regions where they fuse, that is known as a suture. So we have the corona suture, we have the squamous suture, we have the lambdoid suture, as shown in the diagram. And if we zoom in on either one of these three sutures, we basically get the following image. So, we have the bone section and we have this joint shown in blue.