A neurophysiologic monitoring system comprising: a control unit , a main display , a processing unit , a patient module , stimulation electrodes , and recording electrodes , and the system further comprising a non-transitory computer-readable medium for monitoring the health of the lower motor neural pathway during a spinal procedure, comprising instructions stored thereon, that when executed by the processing unit , perform the steps of: delivering, by the stimulation electrodes, a first transcutaneous, trans-abdominal stimulation signal to lumbar motor neural pathways superior to a surgical target site before establishing an operative corridor; recording, by the recording electrodes, a first neuromuscular response to said first transcutaneous, trans-abdominal stimulation signal from one or more locations inferior to the surgical site; delivering, by the stimulation electrodes, one or more subsequent transcutaneous, trans-abdominal stimulation signals to said lumbar motor neural pathways superior to said surgical target site during or after the establishing of the operative corridor; recording, by the recording electrodes, a second neuromuscular response to said one or more subsequent transcutaneous, trans-abdominal stimulation signals from one or more locations inferior to the surgical site; providing, by the recording electrodes, said first neuromuscular response and said second neuromuscular response to the control unit; determining, by the control unit, one or more changes to a stimulation threshold intensity of said first transcutaneous, trans-abdominal stimulation signal and a stimulation threshold intensity of said one or more subsequent transcutaneous, trans-abdominal stimulation signals; and based on the determination, converting, by the control unit, said first and second neuromuscular responses to a health status of neural structures for display; characterised in that the stimulation electrodes comprise a stimulating cathode electrode configured for placement posteriorly on a patient's body and an anode electrode configured for placement anteriorly on a patient's body, and wherein the anode electrode has a larger surface area than the cathode electrode. delivering, by the stimulation electrodes, a first transcutaneous, trans-abdominal stimulation signal to lumbar motor neural pathways superior to a surgical target site before establishing an operative corridor; recording, by the recording electrodes, a first neuromuscular response to said first transcutaneous, trans-abdominal stimulation signal from one or more locations inferior to the surgical site; delivering, by the stimulation electrodes, one or more subsequent transcutaneous, trans-abdominal stimulation signals to said lumbar motor neural pathways superior to said surgical target site during or after the establishing of the operative corridor; recording, by the recording electrodes, a second neuromuscular response to said one or more subsequent transcutaneous, trans-abdominal stimulation signals from one or more locations inferior to the surgical site; providing, by the recording electrodes, said first neuromuscular response and said second neuromuscular response to the control unit; determining, by the control unit, one or more changes to a stimulation threshold intensity of said first transcutaneous, trans-abdominal stimulation signal and a stimulation threshold intensity of said one or more subsequent transcutaneous, trans-abdominal stimulation signals; and based on the determination, converting, by the control unit, said first and second neuromuscular responses to a health status of neural structures for display; characterised in that the stimulation electrodes comprise a stimulating cathode electrode configured for placement posteriorly on a patient's body and an anode electrode configured for placement anteriorly on a patient's body, and wherein the anode electrode has a larger surface area than the cathode electrode. <EOS>