Maeda N, Miyoshi S, Toh H
Nature. 1983 Mar 3;302(5903):61-2. doi: 10.1038/302061a0.
In many groups of vertebrates, the muscle spindle is a specialized sensory organ for the detection of muscle stretching. The structure of the spindle varies among vertebrate classes. Moreover, Barker has asserted that Amphibia are the most primitive vertebrates to possess muscle spindles. Extensive studies, made mainly on the locomotor myotome, seem to show that the muscle receptors of fish are less specialized than those of more advanced animals, and that muscle spindles are absent. However, little attention has been paid to the jaw-closing muscle. We report here our finding of a very simple muscle spindle with a single intrafusal fibre in the well-developed jaw-closing muscle, adductor mandibulae, in a primitive teleostean, Oncorhynchus masou (Brevoort).
在许多脊椎动物类群中，肌梭是一种专门用于检测肌肉伸展的感觉器官。肌梭的结构在不同的脊椎动物类别中有所不同。此外，巴克断言两栖动物是拥有肌梭的最原始脊椎动物。主要针对运动肌节进行的广泛研究似乎表明，鱼类的肌肉感受器不如更高级动物的肌肉感受器特化，且不存在肌梭。然而，人们对咬肌的关注甚少。我们在此报告，在一种原始硬骨鱼马苏大麻哈鱼（Oncorhynchus masou，布雷沃特）发育良好的咬肌——下颌收肌中，发现了一种非常简单的肌梭，其仅含有一条梭内肌纤维。
