The primary vesical sphincter.
D000818:Animals; D004285:Dogs; D005260:Female; D008297:Male; D011470:Prostatic Hyperplasia / Q000503:physiopathology; D011859:Radiography; D014521:Urethra / Q000000981:diagnostic imaging / Q000502:physiology*; D001743:Urinary Bladder / Q000000981:diagnostic imaging / Q000502:physiology*; D014549:Urinary Incontinence / Q000503:physiopathology; D014554:Urination / Q000502:physiology*