Elaine Thompson/Associated Press (Matt Barkley of Southern Cal remains on the board after three rounds.)

The quarterback picks continue to trickle in, at a steady rate of one per round, in this NFL draft.

One quarterback, Mike Glennon of North Carolina State, was chosen in the third round. He was taken by the Tampa Bay Buccaneers with the 11th selection of the round.

That makes it three quarterbacks selected in three rounds of the draft. Florida State’s EJ Manuel was chosen in the opening round Thursday by the Buffalo Bills. West Virginia’s Geno Smith was selected by the New York Jets in the second round earlier Friday.

Southern California’s Matt Barkley and Syracuse’s Ryan Nassib have gone undrafted through three rounds.

Nassib, in particular, had appeared to have a chance to be taken far earlier in the draft. His college coach at Syracuse, Doug Marrone, was hired by the Bills, who had the eighth overall choice in the draft. Buffalo traded down eight spots, intensifying speculation that the Bills would take Nassib. Instead, they opted for Manuel.

This was not expected to be a quarterback-focused draft. But few observers, it seemed, anticipated that the quarterbacks would come off the board quite this slowly.

Another notable pick in the third round came when the Arizona Cardinals selected former Louisiana State cornerback Tyrann Mathieu with the seventh choice of the round.

More draft coverage from The Post:

Former Westfield HS QB Mike Glennon drafted by Bucs

Redskins draft TE Jordan Reed in Round 3

Jordan Reed scouting report | His college stats

Redskins draft CB David Amerson in Round 2

Roundup of Round 2: Te’o, Smith finally chosen

The Early Lead: Smith goes to Jets, has Sanchez in his sights

The Early Lead: Te’o goes to Chargers in Round 2

The Early Lead: Honey Badger says Patrick Paterson helped him get to Arizona

David Amerson scouting report | His college stats

When Amerson visited the Redskins

David Amerson “spider chart” vs. Tyrann Mathieu

Redskins restructure CB Josh Wilson’s contract to save $2 million

Draft order and who’s been taken, updating live

Reid: Redskins need to unearth some gems in later rounds

Winners and losers in Round 1

Jerry Jones upsets Cowboys fans by picking a center

Fisher and eight other O-linemen highlight Round 1

Rams make Ogletree part of RGIII trade