On the ensuing drive, the Rams took advantage of on prime field position on a 47-yard punt return and Case Keenum connected with Brian Quick for a 4-yard touchdown pass to give Los Angeles a 17-13 lead and the eventual win.
Drew Stanton stepped in for Palmer, who did not return to the game, and proceeded to throw a pair of interceptions on the Cardinals final two drives to seal the loss.
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Cardinals coach Bruce Arians said after the game that Palmer is in concussion protocol. Cardinals running back Chris Johnson also left the game in the fourth quarter with a groin injury as the defending NFC West champions fell to 1-3 on the season.
As the Cards sit at the bottom of the division, the Rams are 3-1 and tied for first place with the Seahawks.
