Keywords: Life in Motion Fig 47.png en Fig 47 ”B human muscular fibre magnified 560 times showing the light and dark hands; k nuclei; g Dohie's line A the end of the muscular fibre of a frog magnified 240 times splitting into fibrils f; k nucleus Life in Motion or Muscle and Nervehttps //archive org/details/b21929786 John Gray McKendrick 1892 1926 Life in Motion book Muscle fibers |