First, let me apologize again for going on and on. I have trouble expressing myself in few words, lol.
With regard to your question, the Apostolic Canons are ancient Christian teachings on how the church, the bishops, the faithful should function. I found a pretty good discussion about them on newadvent.org. Apparently, according to that website, the Eastern Church has always acknowledged 85 (or 84 depending on how certain texts group the canons), while the West, only recognize 50. They don’t recognize canons 51 to the end, for some reason. I didn’t get the chance to fully read the article…but here is the link if you want to take a look.