肌梭以外的骨骼肌。相对于梭内肌，梭内肌纤维是指肌梭内部的的肌纤维。 梭内肌受γ运动神经元支配，而梭外肌受α运动神经元支配，β运动神经元对梭内肌、梭外肌都有支配作用。 详情见骨骼肌。
目的：探讨人胸大肌、胸小肌肌梭的形态、分布及其与梭外肌纤维型的关系。
Objective: To study the muscle spindle morphology, distribution and their relationship with the fiber-types in human pectoralis major and pectoralis minor.
结果光镜下可见位于眼外肌肌-腱连接处的EMP神经纤维终止于邻近单个梭外肌纤维的起始处或两侧；
Results Under light microscopy, at the myotendinous junction of the extraocular muscle, the EMP nerve fibers were ended at the initial site or the bilateral sides of a nearby single extrafusal fiber.
模拟失重除影响肌梭外肌纤维MHC的表达、引起肌纤维类型转换外，还导致梭内肌纤维MHC表达表型发生改变。
The simulated weightlessness not only results in changes in expression of MHC in extrafusal fibers and transformation of myofiber type, but also changes in expression of MHC in intrafusal fibers.
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