If however, only the upper motor neurons coming from the primary motor cortex are damage,
the individual develops spastic paralysis.
What happens is that the motor neurons remain intact and the muscles continue to be stimulated.
However, the stimulation is irregular and non-voluntary because it lacks central control.
Exaggerated reflexes because the integration that occurred along the way at various levels via association fibers was removed
The muscles remain healthy longer, but their movements are spastic.
Frequently, this leads to a permanent shortening of the muscles.