电子显微镜下观察 Sarcomere A band band H zone I band Thick filaments -Thin filament -Thick filament Zdisk M line Zdisk 粗肌丝 Thin filaments Z disk Z disk 细肌丝 I band H zone M line Outer edge of A band电子显微镜下观察 Thick filaments Thin filaments 粗肌丝 细肌丝