49ers' Tarron Jackson conscious after sustaining injury - ESPN

SANTA CLARA, Calif. — Roughly 68 minutes into Sunday's practice session, the San Francisco 49ers' workout came to an abrupt halt as defensive end Tarron Jackson went to the ground and didn't get back up.

In what appeared to be a standard running play, Jackson was being blocked by offensive tackle Isaac Alarcon when he went down. Teammates quickly shouted for the training staff as Jackson was briefly motionless before moving his hands. His teammates dropped to a knee, and the team and sideline went silent for the next six minutes as a cart brought out a stretcher for Jackson. He was taken off the field roughly seven minutes after the injury, and an ambulance took him to Stanford Hospital about 21 minutes after he first went down.

According to coach Kyle Shanahan, Jackson was talking and moving his extremities soon after, giving hope that he had avoided any sort of serious injury.

"[You're] always scared when someone gets taken off on a stretcher," Shanahan said. «He's conscious, communicating with us, can feel all his extremities and they're taking him down to Stanford now to start further testing. So, hopefully we cleared the real scary stuff.»

The 49ers originally signed Jackson, a fourth-year pro out of Coastal Carolina, to their practice squad in early January. They then signed him to a futures contract after the season. Jackson spent his first three seasons with the Philadelphia Eagles before splitting last year between the Eagles, Carolina Panthers and 49ers.

Through the first four practices, Jackson had been working mostly with the third string defensive line. After he was taken off the field Sunday, Shanahan asked his shaken-up team if it wanted to finish practice.

«We were close to him so we could hear him