Anatomy memorising

Hello everyone,
I am struggling with remembering stuff that looks like a tree… One thing is divided into 2 others, those 2 are then divided into many more and so on.
I don’t find difficult to remember the structure of the “tree” itself, but the problem is, that this little branches are composed of just one 2-4 words definition in language I am not familiar with… So I often forget lot of “branches” and I cannot remember what those branches were.
Exactly it is remembering the system of arteries, veins and nerves of the human body.
I am mainly using the technique of finding some sentence which is composed of words that are tightly connected with the actual nerves… But this technique is often worthless because those terms are composed of several words, ending up with the whole text and not just a sentence to remember.
Thank you very much for any advice.