I have shit for visual memory and hadn't had anatomy before I came in to medical school. My average in anatomy was close to 100% because I studied my ass off. I did below par the first two practicals (85%-90%) but I kept tweaking what I did until I found a way to obliterate that class. What I did:

Woke up at 6 every day, ran on half of em, went to school, and looked at atlases (Rohen + Netter). Went to lecture, then dissection, quick lunch and more atlas time. Would go down to the lab from late afternoon until evening (~10 pm-12) to practice identifying structures with friends and with anyone else that would listen to my shit or better yet teach me. Interacting with other people in lab was honestly where I learnt most of my stuff, and shifting more of my hours to being in lab was huge. On weekends I would read BRS Anatomy for the sections we covered and do lots of practice questions via the book and online. It was a miserable 2 months and most of the time I felt like dirt because everyone learnt the material faster than me. But I still rocked that class harder than I have in any other class in med school.

If you want to be a neuro or cardiothoracic surgeon, you need to be good at this shit. Your life isn't over because you got a 75%. But you're doing your future patients a disservice if you just give up and resign yourself to that. It's even ok to get another 75%, but start trying a new routine, look for a way to do better. What I did might not work for you. But try elements of that, elements of what other people who have done well or are doing well in your class are doing. Don't stop until you find a way to master it.