How does Naruto's right arm work? Spoiler alert for those who haven't finished the manga or the anime


   After the Naruto and Sasuke fight (in Naruto volume 72: Uzumaki Naruto chapters 694-698), both of them lost one of their arms above the elbow.  After a while, Naruto got a fake arm (I think Sasuke didn't) which was wrapped in bandages (it was shown in the rest of the mangas, The Last: Naruto the Movie, and Boruto: Naruto the Movie).
 


It was shown in the movies and in the manga that his arm can move and act like his arm used to before he lost it, so he can use it for eating, writing, carrying things, holding things, waving hand signs, releasing jutsus, etc.. But how does it work? I know it was created by Tsunade, and since she's an excellent medical ninja she could have found a way or something, but was it ever mentioned of how it worked or anything? I mean, I know the Naruto Universe evolved over time and stuff, so I guess they found a way to create body part that works like they used to.
From Narutopedia : 


  Naruto loses his right arm after the Fourth Shinobi World War, though it is later replaced by a fully maneuverable prosthetic arm made of Hashirama Senju's cells, wrapped completely in bandages


I'm not sure it makes sense that it is prosthetic and made up of Hashirama's cells, since a prosthetic limb is, by definition, artificial. The definition for prosthetic on Merriam-Webster is 


  an artificial device that replaces a missing or injured part of the body


Perhaps there are both organic and artificial components.

Well, regardless, Narutopedia states that the arm is fully maneuverable. I could be wrong on this point, but I don't think Naruto has any trouble moving the arm. So with the arm moving the same as a normal arm and with it having organic components (Hashirama's cells), I think it is reasonable to assume it is connected to his nervous system, thus allowing it to function as a normal arm.