Urinary control relies on the finely
coordinated activities of the smooth muscle tissue of the
urethra and bladder, skeletal muscle, voluntary inhibition,
and the autonomic nervous system. Urinary incontinence can
result from anatomic, physiologic, or pathologic (disease)
factors. Congenital and acquired disorders of muscle innervation
(e.g., ALS, spina bifida, multiple sclerosis) eventually
cause inadequate urinary storage or control.