Hanson J, Lennerstrand G, Nichols K C
Acta Physiol Scand. 1980 Jan;108(1):61-71. doi: 10.1111/j.1748-1716.1980.tb06500.x.
Transversal sections of the inferior oblique muscle from kittens of various ages and from adult cats were stained for myofibrillar ATP-ase at Ph 9.4 and 4.35, succinic dehydrogenase (SDH) and fat. The same muscles had previously been submitted to studies of contractional and fatigue properties. With ATPase the fibers could be differentiated into types I, II and II C. The percentages of each fiber type remained approximately the same from birth onwards. In the inner, global layer of the muscle, type I fibers showed a linear increase in size, but types II and IIC fibers an accelerated growth after age 20 weeks. In the outer, orbital layer, where no type I fibers were seen, type II and II C fibers showed the same growth pattern as in the global layer. The fiber content of SHD and fat was low at birth but increased after two weeks of age. Type I fibers were poor and type II C fibers rich in SDH and fat. Type II fibers showed varying amounts of these substances. Provided that type I fibers are slow, type II fast and type II C intermediate in speed of contraction, like in other muscles, the findings on fiber growth and SDH content seem to support the idea that slow, fatigue resistant components in eye muscles reach maturity earlier than fast components.
对不同年龄小猫及成年猫的下斜肌横切片进行染色，以观察pH 9.4和4.35条件下的肌原纤维ATP酶、琥珀酸脱氢酶（SDH）和脂肪。同样的肌肉之前已进行过收缩和疲劳特性研究。通过ATP酶可将纤维分为I型、II型和II C型。从出生起，每种纤维类型的百分比大致保持不变。在肌肉的内层、整体层中，I型纤维大小呈线性增加，但II型和IIC型纤维在20周龄后生长加速。在没有I型纤维的外层、眶层中，II型和II C型纤维的生长模式与整体层相同。出生时SDH和脂肪的纤维含量较低，但在两周龄后增加。I型纤维中SDH和脂肪含量少，II C型纤维中含量丰富。II型纤维中这些物质的含量各不相同。假设I型纤维收缩速度慢，II型纤维收缩速度快，II C型纤维收缩速度介于两者之间，如同其他肌肉一样，关于纤维生长和SDH含量的研究结果似乎支持这样一种观点，即眼肌中抗疲劳的慢收缩成分比快收缩成分更早成熟。
