ARLINGTON, Texas (AP) Seahawks receiver Ricardo Lockette sustained a concussion but had movement in all of his extremities after being taken off the field on a stretcher when knocked down by a vicious hit on a kickoff late in the first half Sunday.

Lockette was running down the field and appeared to be engaged with another Dallas Cowboys player before he turned and then ran into a block by safety Jeff Heath. Lockette immediately slumped to the ground on his side and appeared to be unconscious when trainers and medical officials quickly got there to attend to him.

After Lockette was put on a stretcher and was loaded onto a motorized cart several minutes later, the receiver's facemask had been removed from his helmet and he could be seen talking while moving both hands. He pointed his right hand toward his Seattle teammates on the sideline, and then thrust his index finger high into the air.

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An announcement was made in the press box after halftime updating his condition.

Heath was penalized for a blind-side hit, though replays showed that the contact was with the players facing each other and to the upper body.

While Lockette was being tended to, several Seahawks players were in the middle of the field and players from both teams were jawing at each other. Coaches and officials got between the players.

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AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL