Nerve fibre Number of cells: diameter day 0 day 10 day 14 0.2 0 0 0 0.6 0 0 0 1.0 6 1 10 1.4 19 1 34 1.8 28 9 37 2.2 26 7 30 2.6 27 7 23 3.0 33 11 23 3.4 35 10 16 3.8 27 8 22 4.2 18 10 23 4.6 24 10 21 5.0 11 14 19 5.4 17 13 13 5.8 11 10 5 6.2 14 7 12 6.6 9 12 10 7.0 13 11 6 7.4 8 14 10 7.8 6 9 11 8.2 12 11 10 8.6 4 3 8 9.0 8 9 6 9.4 6 4 1 9.8 9 6 6 10.2 6 6 8 10.6 5 11 3 11.0 2 7 5 11.4 0 10 1 11.8 5 7 2 12.2 2 3 0 12.6 1 6 1 13.0 0 4 0 13.4 2 5 0 13.8 0 4 0 14.2 0 7 0 14.6 1 5 1 15.0 2 11 4 15.4 1 5 0 15.8 1 2 1 16.2 1 5 0 16.6 0 4 1 17.0 1 2 1 17.4 0 1 0 17.8 0 5 1 18.2 0 1 1 18.6 1 6 0 19.0 0 3 0 19.4 0 1 0 19.8 0 0 0 * 0 3 0