Bewick G S, Rowlerson A, Tonge D A, Holder N
Division of Biomedical Sciences, King's College, Strand, London.
J Comp Neurol. 1991 Jan 22;303(4):551-62. doi: 10.1002/cne.903030404.
The characteristics of motor units in the iliotibialis posterior muscle of the axolotl hindlimb are described. Tension recording and intracellular electrophysiological methods demonstrate that the physiological properties of the population of motor units are continuously distributed rather than grouped into a series of discrete types. Overlap between motor units occurs and this is positively correlated with motor unit size but negatively correlated with differences in time to peak tension. Immunocytochemical staining with antimyosin antibodies combined with histochemical demonstration of actomyosin ATPase activity revealed at least four types of muscle fibre which were distributed asymmetrically within iliotibialis posterior. The results are discussed in terms of the continuous growth of the muscle and the interactions between muscle and nerve in the formation of the axolotl motor system.
描述了蝾螈后肢胫后肌运动单位的特征。张力记录和细胞内电生理方法表明，运动单位群体的生理特性是连续分布的，而非分为一系列离散类型。运动单位之间存在重叠，且这与运动单位大小呈正相关，但与达到张力峰值的时间差异呈负相关。抗肌球蛋白抗体免疫细胞化学染色结合肌动球蛋白ATP酶活性的组织化学显示，至少有四种类型的肌纤维不对称地分布在胫后肌内。根据肌肉的持续生长以及蝾螈运动系统形成过程中肌肉与神经之间的相互作用对结果进行了讨论。
