Position of myocardial and Root injury of brachial plexus on MRI Locati on Damage No damage Total Amou nt percenta ge Amou nt percenta ge Amou nt percenta ge C5 46 76, 6 14 23, 4 60 100 C6 49 81, 6 11 18, 4 60 100 C7 51 85, 0 9 15, 0 60 100 C8 43 76, 2 17 28, 3 60 100 T1 31 51, 7 29 48, 3 60 100 Total 220 73, 33 80 26, 67 300 100 Table 3.24.