[caption id="attachment_1175" align="alignnone" width="100"] ESPN.com[/caption]The Dallas Cowboys secondary was dealt a blow today with cornerback Mike Jenkins listed as inactive for today's NFC East matchup against the Eagles.  Jenkins missed the last two days of practice due to a back injury.Dallas CowboysRB DeMarco Murray Safety Matt Johnson Linebacker Dan ConnorGuard/center David ArkinCenter Phil Costa Defensive lineman Sean LissemoreFollow @TrueBlueNation1 on Twitter, become a fan on Facebook.