Medical and surgical devices and instruments for treatment of the spine and for nerve surveillance, guidance, and monitoring, namely, bone screws, pedical screws, cross-connectors, spacing devices, alignment devices, insertion and extraction devices, prosthetic intervertebral discs, implants consisting of artificial materials, implant materials in the nature of PEEK and titanium, implant anchorages, biologics in the nature of demineralized bone matrix, bone marrow aspirate, allografts, synthetic scaffolds, and amniotic tissue barriers, and nerve surveillance systems comprising electrodes, sensors, monitors, cabling, and computer hardware and recorded software applications for intraoperative nerve monitoring and operating software therefore; optical devices for use in surgical and medical targeting, namely, light guides and other instruments designed to help surgeons accurately approach and work in surgical sites