The lower urinary tract.
D005260:Female; D006801:Humans; D008297:Male; D009092:Mucous Membrane / Q000502:physiology; D009130:Muscle, Smooth / Q000502:physiology; D009626:Terminology as Topic; D014521:Urethra / Q000033:anatomy & histology / Q000187:drug effects / Q000294:innervation; D001743:Urinary Bladder / Q000033:anatomy & histology / Q000187:drug effects / Q000294:innervation; D014553:Urinary Tract Physiological Phenomena