Urinary incontinence pathophysiology

Explain the pathophysiology of the major types of urinary incontinence (urge, stress, overflow, and functional) and pediatric enuresis. 

Rovner ES, Wyman J, Lackner T, Guay D. Urinary incontinence. In DiPiro JT, Talbert RL, Yee GC et al, eds. Pharmacotherapy a Pathophysiologic Approach. 6th ed. New York McGraw-Hill, 2005 1547-1563. 

Payne CK (1998) Epidemiology, pathophysiology and evaluation of urinary incontinence and over-active bladder. Urology 51 3-10... 

Urinary incontinence—Involuntary leakage of urine. May result from urethral underactivity (stress urinary incontinence), urethral overactivity (overflow incontinence), or mixed pathophysiologic mechanisms. 

---