The external urethral orifice (orificium urethræ externum; urinary meatus) is placed about 2.5 cm behind the glans clitoridis and immediately in front of that of the vagina; it usually assumes the form of a short, sagittal cleft with slightly raised margins. Nearby are the openings of the Skene's ducts.
The vaginal orifice is a median slit below and behind the opening of the urethra; its size varies inversely with that of the hymen.
Research data from China Medical University, Department of Pediatric Surgery update understanding of embryonic research.(Report)
Nov 27, 2010; A new study, 'Embryonic development of the internal anal sphincter in rats with anorectal malformations,' is now available....