This is a preserved, vintage specimen of a human bladder that has been perforated by a bullet. Note the rod running diagonally through the bladder walls to show the path of the projectile. (The anterior wall has been opened vertically so that the wound track is clearly visible.) There's no way to know if the bullet remained in the body after blowing through both bladder walls. Our anatomical specimens contain a wealth of relevant information to medical students, forensic students, and the general public. Sometimes they even help us understand crime dramas better.