Ultrastructural analysis of alpha motoneuron synaptic coverings. Quantitative ultrastructural analysis of synaptic coverings and number of boutons/100 μm of motoneuron membrane. (A) Percentage reduction in synaptic covering in the experimental groups after injury as well as a protective effect of inflammation. (B) Number of boutons/100 μm of membrane; there were no statistically significant differences between the lesioned groups. Bars marked with different letters are statistically different at p < 0.05.