This is the result of disturbance in lower motor neuron. The muscle or group of muscles affected may be totally paralyzed if all their available neurons are put out of action. If only some anterior horn neurons are involved the muscles will show partial paralysis and will appear to be very weak.
Any muscles affected in this way would be unable to function as members of a team and consequently movement synergies requiring their participation would be abnormal and substitute patterns would be produced. If only a small muscle group is affected in this way the abnormalities are minimal but if many groups are involved substitution can be grotesque or even inadequate in which case the subject is rendered relatively helpless. Totally flaccid muscles have no lower motor neuron supply because of damage or injury to all the cells in their motoneuron pools or to all the fibres passing…
