Cow eye, fetal pig esophagus/lungs/trachea, sheep kidney and brain.
During my physiology segment I was recommended for and chosen to participate in my school's cadaver prosection class and I took it concurrently with my other classes. Not only did we dissect the entire body (including using a medical saw on the skull to extract the brain!), but we also had to learn surgical procedures to demonstrate for a health expo our school was throwing for hundreds of high schoolers. We had Army surgeons come in and train us. I was assigned to demonstrate an appendectomy and a cholescystectomy.
It was an amazing experience. If your school has something for you to apply to like that, I would go for it. It really helped with my learning. The fact is, book diagrams only help so much. Many times I'd be dissecting our cadaver and say, "Ohhh, so THAT'S where it is/what it looks like!"
It's also a very fancy thing to have on your transcript or resume for nursing school applications.