Aikawa M, Shimozawa A
Department of Anatomy, Dokkyo University School of Medicine, Tochigi, Japan.
Okajimas Folia Anat Jpn. 1994 Mar;70(6):329-33. doi: 10.2535/ofaj1936.70.6_329.
To elucidate the relation between the caliber of myelinated nerve fibers (MNFs) and motor unit size (i.e., number of muscle fibers per motor unit), motor unit size was measured for the mouse m. stylohyoideus, innervated predominantly by extra large MNFs, and compared with that of the mouse m. stapedius, innervated predominantly by large MNFs. All muscle fibers and MNFs were counted morphologically, and mean motor unit size was calculated for each muscle. The results showed that the average of 12 mean motor unit sizes for the m. stylohyoideus (35.8 +/- 8.2), innervated predominantly by extra large MNFs, was greater than that for the m. stapedius (6.5 +/- 1.3), innervated predominantly by large MNFs.
为了阐明有髓神经纤维（MNFs）的直径与运动单位大小（即每个运动单位中的肌纤维数量）之间的关系，对主要由超大MNFs支配的小鼠茎突舌骨肌的运动单位大小进行了测量，并与主要由大MNFs支配的小鼠镫骨肌的运动单位大小进行了比较。对所有肌纤维和MNFs进行形态学计数，并计算每块肌肉的平均运动单位大小。结果显示，主要由超大MNFs支配的茎突舌骨肌的12个平均运动单位大小的平均值（35.8 +/- 8.2）大于主要由大MNFs支配的镫骨肌的平均值（6.5 +/- 1.3）。
