A system comprising: an access system for establishing an operative corridor to a spinal target site via a lateral, trans-psoas approach including a surgical accessory having a plurality of stimulation electrodes; a sensing electrode configured to sense a neuromuscular response of a muscle coupled to a nerve depolarized by a stimulation current signal emitted from at least one of said plurality of stimulation electrodes; wherein said sensing electrode includes an electromyographic electrode and a control unit capable of electrically stimulating said plurality of stimulation electrodes on said surgical accessory, receiving neuromuscular response data from said sensing electrode, and determining a direction from the surgical accessory to said nerve based upon the sensed response; wherein the control unit is configured to: a) electrically stimulate a first stimulation electrode with a first current signal, determine whether a first stimulation current threshold at which the nerve will depolarize has been bracketed, stimulate a second stimulation electrode with a second current signal, determine whether a second stimulation current threshold at which the nerve will depolarize has been bracketed, wherein a stimulation current threshold at which the nerve will depolarize means a minimum stimulation current which produces a significant EMG response, and determining whether a stimulation current threshold has been bracketed means determining if a stimulation current threshold falls within an initial bracketing range; b) determine a first range for the first stimulation current threshold, and determine a second range for the second stimulation current threshold, each range having a maximum stimulation current threshold value and a minimum stimulation current threshold value; c) process the first and second ranges and display an arc indicating a general direction of a nerve from the surgical accessory; d) electrically stimulate the first stimulation electrode with a third current signal, determine whether the first stimulation current threshold has been bracketed, stimulate the second stimulation electrode with a fourth current signal and determine whether the second stimulation current threshold has been bracketed; e) electrically stimulate each electrode until a stimulation current threshold has been bracketed; and f) display an arc indicating a general direction of a nerve from the surgical accessory and narrow the arc as stimulation current thresholds are bracketed; g) electrically stimulate the first and second stimulation electrodes to bisect the first and second initial bracketing ranges until a first stimulation current threshold has been found for the first stimulation electrode and a second stimulation current threshold has been found for the second stimulation electrode within a predetermined range of accuracy; and h) display an arc indicating a general direction of a nerve from the surgical accessory and narrow the arc as stimulation current threshold brackets are bisected. a) electrically stimulate a first stimulation electrode with a first current signal, determine whether a first stimulation current threshold at which the nerve will depolarize has been bracketed, stimulate a second stimulation electrode with a second current signal, determine whether a second stimulation current threshold at which the nerve will depolarize has been bracketed, wherein a stimulation current threshold at which the nerve will depolarize means a minimum stimulation current which produces a significant EMG response, and determining whether a stimulation current threshold has been bracketed means determining if a stimulation current threshold falls within an initial bracketing range; b) determine a first range for the first stimulation current threshold, and determine a second range for the second stimulation current threshold, each range having a maximum stimulation current threshold value and a minimum stimulation current threshold value; c) process the first and second ranges and display an arc indicating a general direction of a nerve from the surgical accessory; d) electrically stimulate the first stimulation electrode with a third current signal, determine whether the first stimulation current threshold has been bracketed, stimulate the second stimulation electrode with a fourth current signal and determine whether the second stimulation current threshold has been bracketed; e) electrically stimulate each electrode until a stimulation current threshold has been bracketed; and f) display an arc indicating a general direction of a nerve from the surgical accessory and narrow the arc as stimulation current thresholds are bracketed; g) electrically stimulate the first and second stimulation electrodes to bisect the first and second initial bracketing ranges until a first stimulation current threshold has been found for the first stimulation electrode and a second stimulation current threshold has been found for the second stimulation electrode within a predetermined range of accuracy; and h) display an arc indicating a general direction of a nerve from the surgical accessory and narrow the arc as stimulation current threshold brackets are bisected.