This is the condition of abnormal bladder function due to a lesion in the spinal nerve. There are two major types of neurogenic bladder: spastic neurogenic bladder: the lesion is above the spinal cord center of (S2-4), therefore it is an upper motor neuron problem. It is characterized by hypertonic bladder; reduction of bladder capacity; presence of residual urine in the bladder. flaccid neurogenic bladder: the lesion involves the spinal cord center of (S2-4), it is an lower motor neuron problem. It is characterized by hypotonic bladder, the bladder is flaccid with low flow rates and there is a large volume of residual urine.