3B Scientific A26 30th Week of Pregnancy Natural Cast Fetal Skull Model on Stand, 7.3" x 5.7" x 5.5" The anatomy of a human fetal skull can be studied easily with this replica The skull model is a natural cast of a fetal head in the 30th week of pregnancy showing the characteristics of prenatal development The fontanelles, which becom bone over time, are clearly visible on the fetal skull Sutures wil form along the bony plates helping fuse the fetal skull as the individual ages Fetal skull on stand