So we have the bone and the bone marrow, the red bone marrow and the yellow bone marrow are basically formed from our mesoderm layer as well as our cartilage. Now together the cardiac muscle which consists of these two types of muscle, the cardiovascular system which consists of these two types of muscle as well as the skeletal system, makes up the musculoskeletal system. And so the entire musculoskeletal system which begins with M, is formed from the mesoderm germ layer. Now what else is formed from the mesoderm germ layer. So what else contains vessels? Well, the lymphatic system contains vessels.