Development of myofibrils in myotome muscle of chick embryos may be divided into two phases. During the first, with which the present observations are concerned, "primary" fibrils arise in the cytoplasm of the presumptive muscle cells. During the second period the number of myofibrils increases apparently by splitting of the primary fibrils.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Weed, Isabelle G.
"The Cytology of Developing Muscle,"
Proceedings of the Iowa Academy of Science, 43(1), 400-400.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/153