Plastinated cast of the blood vessels (pink) supplying the kidney and the renal pelvis (yellow, not the same as the pelvic bone), which collects urine and carries it to the bladder. Plastination and cast-making provide an excellent way to study complex networks of vessels such as this one, and help biologists to examine them without the disruption to structures that can be caused by classical dissection techniques.

Image courtesy of the RVC.