widgets HalWa TeLiNgA MySpace Music Playlist at MixPod.com Friday, July 31, 2009 My LiFe wItH MyAsThEnIa GrAvIs....... DEFINITION Myasthenia gravis (sometimes abbreviated MG; from the Greek myastheneia, lit. 'condition of no strength in the muscle', and Latin gravis , 'serious') is a neuromuscular disease leading to fluctuating muscle weakness and fatiguability