Vesicourethral continuity in bladder neck activity

Electromyographic study of the bladder neck during vesical filling and emptying was performed in anesthetized dogs. Increased electrical potentials denoting active contraction of bladder neck were obtained on vesical filling. The bladder was then completely divided just above the vesical orifice, and the resulting apertures were closed to form two separate compartments. Still increased electrical potentials of bladder neck were recorded on filling the proximal compartment. We conclude that vesical neck activities are not directly dependent on the detrusor or on any anatomic continuity between bladder and urethral muscles.