Updated on November 11, 2024 Overview Sympathetic outflow works to favor relaxation of the bladder (reduces intravesicular pressure) and constriction of the neck and urethra (increases intraurethral pressure) favoring urinary retention. Parasympathetic outflow stimulates contraction (raises intravesicular pressure) favoring voiding. Normal bladder post-void residual is about 50mL. The bladder typically holds about 1L max. The...