Invertebrate striated muscle, the Z-line, which defines the sarcomere length, presents diverse structural patterns both in cross section and in longitudinal section. Conflicting models have been proposed to explain the microscopic observations. The protein composition of the Z- line structure is unresolved. o: -Actin in is widely accepted as a Z-line component, and actin filaments extend into wide Z-lines. Based on recent findings from our laboratory and others, we developed a new model applicable to wide and narrow Z-lines. The model allowed the observed ultrastructural patterns of Z-lines to be simulated. Improved electron microscopic techniques should allow further progress to be made in Z- line research , an area of interest both because of the degradation of the Z-line in meat storage and the abnormalities of Z- lines that characterize a wide range of muscle disorders
Yamaguchi, M.; Kamisoyama, H.; Nada, S.; Yamano, S.; Izumimoto, M.; Hirai, Y.; Cassens, R. G.; Nasu, H.; Muguruma, M.; and Fukazawa, T.
"Current Concepts of Muscle Ultrastructure With Emphasis on Z-Line Architecture,"
2, Article 3.
Available at: http://digitalcommons.usu.edu/foodmicrostructure/vol5/iss2/3