Precautionary X-rays coming for Heyward-Bey

Raiders receiver Darrius Heyward-Bey has exited Oakland’s game at the Metrodome with a head/neck injury. Per a league source, Heyward-Bey is being taken to a local hospital for precautionary X-rays. Heyward was moving his extremities after taking a knee to the head, which knocked his helmet off. UPDATE 6:10 p.m. ET:  Heyward-Bey will be flying…