The Octagon has a blue corner and a red corner, and fighters are assigned to each. They wear blue or red tape around their gloves to indicate which corner they are in for the particular bout. After making their entrance, the opponents wait in their respective corners until the ref starts the fight.
Three licensed judges score each round of every fight in case both men are still standing in the end. In these cases, the fight goes to decision and the winner is determined by the judges' scores.
One referee is outside of the Octagon before the fight to inspect the body for any foulplay and to ensure that the fighter is wearing a cup and mouthpiece. Once a fighter has been inspected, they must immediately enter the cage. There is one referee in the cage to enforce the rules, instruct the fighters and, if necessary, stop the fight.
Joe Rogan and Mike Goldberg commentate on the fight from cageside. Once the fight is over, Joe Rogan will enter the cage and interview the fighters.
Cutmen are assigned to either the red or blue corner and work with whichever fighter is in that corner for the night. Before the fighter goes into the cage, a cutman applies vaseline to the the eyebrows and cheeks, which are the areas prone to cuts. The cutmen don't enter the cage between rounds unless a fighter is cut or has facial swelling.
The UFC Execs watch the event from cageside seats. They decide who wins Submission of the Night, Knock Out of the Night and Fight of the Night and present the awards to fighters at the end of the event.
Cornermen are there to motivate and provide instruction between rounds and they are usually part of a fighter's training camp. Only two people are allowed to enter the cage for each corner, so if a cutman is required, only one of the cornermen can enter between rounds. The cornermen also massage muscles, apply ice and provide water if necessary.
These babes holding the numbers are there for more than just eye candy - they remind you of what round it is. One girl circles the outside of The Octagon holding the number between rounds.