Full Skeleton Explorer

203 bones, and the gap from 206 reconciles exactly. Seven of the 206 are not here, because BodyParts3D publishes no coccyx and none of the six auditory ossicles. Four are here that the 206 leaves out: the two sesamoid bones under each big toe. So 206 minus seven plus four is 203. The bone meshes come to 203 as well, by a different route: the sternum is three meshes, the manubrium, the body and the xiphoid process, where the textbook figure treats it as one bone, and each foot’s two sesamoids share one mesh. The model carries 248 structures in total, because 45 of them are not bones: 23 intervertebral discs and 16 costal cartilages are cartilage, and 4 interosseous membranes and 2 long plantar ligaments are neither. Those sit in their own bands rather than being counted as bone.

Of the textbook 206, only the coccyx and the six auditory ossicles, which BodyParts3D does not publish; no bone the dataset does publish is missing, and that is checked rather than claimed. The part list is generated from the dataset’s own part-of hierarchy, and a test asserts it matches the leaves under the skeletal system root exactly, in both directions, less three named exclusions. A bone therefore cannot be dropped without failing a test, and one cannot be invented either. Two things that test caught: a first pass banded only 231 parts and looked perfectly healthy, because twenty bones are filed by shape rather than by region, and the subtree also contains an eyeball and two sets of gums, because the dataset records anatomical containment rather than tissue class. Those three are the exclusions.

Because it is 2,362,198 triangles, which is about 12 megabytes compressed. The ribs and the scapulae alone are about two fifths of it: long thin curved shells are the worst case for a triangle budget, since a surface enclosing almost no volume has nothing to amortise its own area against. Nothing downloads until you press the button and the figure is printed on it, so this costs nothing unless you want it, and once you have it the model is kept on your device and opens without asking next time. If you only need one area, the individual regions are a fraction of the size.

It may not, and as one of the heavier models here it is a real question. Two and a third million triangles needs roughly 45 megabytes of graphics memory before anything is drawn, which is comfortable on a laptop and near the limit on an older phone. If it fails the viewer falls back to the structure list rather than showing an error, so you still get every name, and the smaller regions are a better choice on a phone regardless: a single limb is under a megabyte and the skull only a little over one, and both turn smoothly.