Photos Of Cervical Polyps I Found What Appears To Be An Atlas (first Cervical Vertebra.) What Animal Is This From?

I found what appears to be an Atlas (first cervical vertebra.) What animal is this from? - photos of cervical polyps

Here are some pictures. Thanks

http://www.flickr.com/photos/iriewoman/3525705021/in/set-
72157618050703462 /
http://www.flickr.com/photos/iriewoman/3526512054/in/set-72157618050703462/
http://www.flickr.com/photos/iriewoman/3526512066/in/set-72157618050703462/