he authors observed that the scapula appeared lateral to the body wall, near the limb bud (see above, ribs: white; scapula: green), and with similar muscular connections in the three embryos. The ribs of the turtle embryo were shorter in length while the ribs of the mouse and chicken had grown ventrally into the lateral body wall. At this stage, except for minor positional differences and rib length, the musculoskeletal pattern of the embryos was quite similar. But from this point on the turtle embryo began to differ from the other two.