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本文通过对３～９个月胎龄胎儿眼球直肌超微结构的初步研究，发现３～９个月胎龄胎儿眼球直肌的肌纤维在电镜下分为两种类型，即快纤维和慢纤维。且两种纤维处于不同状态，快纤维多处于舒张状态，而慢纤维多处于收缩状态。上直肌中以快纤维为主，内直肌中以慢纤维为主。３个月时，胎儿即有完整的Ｚ线，其中快纤维表现出一条双Ｚ线。同时随着胎龄增长，线粒体、内质网亦增多，并可见吞饮小泡。在肌细胞周围亦可见到肌卫星细胞
In this paper, 3 to 9 months old fetus fetus ocular rectus muscle ultrastructure of the preliminary study found that 3 to 9 months old fetus fetal eye rectus muscle fibers under the electron microscope divided into two types, namely, fast and slow fibers . And the two fibers are in different states, the fast fibers are mostly in the diastolic state, while the slow fibers are mostly in the contracted state. The upper rectus muscle mainly in fast fibers, mainly in the rectus muscle slow fibers. At 3 months, the fetus has a complete Z line, of which fast fibers exhibit a double Z line. At the same time with the increase of gestational age, mitochondria, endoplasmic reticulum also increased, and can be seen swallow drink vesicles. Muscle satellite cells can also be seen around the muscle cells