Horcholle-Bossavit G, Jami L, Thiesson D, Zytnicki D
Laboratoire de Neurophysiologie, Collège de France, Paris.
Brain Res Dev Brain Res. 1990 Jul 1;54(2):205-15. doi: 10.1016/0165-3806(90)90143-m.
In 1- to 72-day-old kittens, motoneurons of the 3 peroneal muscle nuclei were labeled by retrograde axonal transport of horseradish peroxidase from individual muscles. At birth, the locations of peroneal nuclei were similar to those of the adult cat. Counts of motoneurons at different ages indicated that postnatal cell death does not occur in peroneal motor nuclei. Primary dendrites were as numerous in motoneurons of newborn kittens as in adult motoneurons but they were thinner, shorter and poorly ramified. The number of recurrent axon collaterals was higher in the first postnatal week than at later stages. The growth of motoneurons followed similar rates in the 3 peroneal nuclei. Distributions of cell body diameters and volumes were unimodal at birth and became bimodal between 15 and 20 days postnatal. The separation of peroneal motoneurons in two size subgroups, presumably corresponding to alpha and gamma populations, was followed by an increase in growth rate which became faster for alpha than for gamma motoneurons.
在1至72日龄的小猫中，通过辣根过氧化物酶从各个肌肉进行逆行轴突运输，标记了3个腓骨肌核的运动神经元。出生时，腓骨核的位置与成年猫相似。不同年龄运动神经元的计数表明，腓骨运动核中不会发生出生后细胞死亡。新生小猫运动神经元的初级树突数量与成年运动神经元一样多，但它们更细、更短且分支较少。出生后第一周的返回轴突侧支数量比后期更高。3个腓骨核中运动神经元的生长速率相似。出生时细胞体直径和体积的分布是单峰的，在出生后15至20天之间变为双峰。腓骨运动神经元分为两个大小亚组，可能分别对应于α和γ群体，随后生长速率增加，α运动神经元比γ运动神经元增长得更快。
