ok now i've seen ALOT of people saying 'Orochimaru cant use his arms' i'd just like to clear that up in fact form

Q. But why can he use his arms again?
A. His new body

Q. Do you have evidence of him using his arms again?
A. Why yes i do, Chapter 201, Page 16 - hes resting his head on his palm.

Q. But why would he seek Tsunade if he could just change bodies?
A. Orochimaru said himself that even if Tsunade did not heal his arms "There is still another way"
It seems that Orochimaru did not want to swap bodies due to the fact that he couldnt swap again for another 3 yearish.