The relationship between the bladder and EUS is controlled by reflex pathways in the lumbosacral spinal cord that are activated by primary afferent input from the bladder or the urethra.

• 膀胱与外尿道括约肌之间的互动，是由膀胱或尿道发出传入讯息然后兴奋腰荐脊髓间的反射路径的调控。