Four additional lawsuits were filed against the NCAA and specific member conferences last week regarding concussions.

One of the four suits is led by Ray Griffin, the brother of two-time Ohio State Heisman Trophy winner Archie Griffin. Ray played defensive end at Ohio State from 1974-77 but the suit does not mention the Buckeyes; only the NCAA and the Big Ten.

Griffin’s suit notes “Defendants Big Ten and the NCAA have kept their players and the public in the dark about an epidemic that was slowly killing their athletes” and that “despite knowing for decades of a vast body of scientific research describing the danger of TBIs, Defendants failed to implement procedures to protect Plaintiff and other Ohio State football players from the long-term dangers associated with them. They did so knowingly and for profit.”

The four suits bring the total of concussion-related lawsuits against the NCAA to 10 in recent weeks. Six suits were filed in May, though one of the plaintiffs in the six suits removed his name because he was unaware he’d be suing both Penn State and the Big Ten.

Other suits were filed by Derrick Lee, a former Duke player, ex-Tennessee player O.J. Owens and former Michigan Wolverine Steve Strink. Only Lee’s suit names his former school in addition to the ACC and NCAA; both Owens (SEC) and Strink (Big Ten) name their conferences and the SEC.

The NCAA did not respond to the AP’s request for comment regarding the suits.