The second day of the 2012 NFL combine has begun, and the quarterbacks, wide receivers, and running backs are set to arrive on Thursday.

That group is the second wave of players to touch down in Indianapolis, as the specialists (punters/kickers/long snappers), offensive linemen, and tight ends arrived on Wednesday and will partake in measurements, psychological testings, and interviews with both the media and teams on Thursday.

The Thursday arrivers, which includes two highly-touted players in Stanford's Andrew Luck and Baylor's Robert Griffin III (the consensus top quarterback prospects in the draft), will complete medical examinations and begin interviews of their own later today.

Boston College's Luke Kuechly, widely regarded as the top inside linebacker prospect in the draft, will arrive with the rest of the linebackers on Friday.

For more draft coverage, check out SB Nation's 2012 NFL Draft hub and Mocking The Draft, who has staff on the ground in Indy this week.