<prompt> In a sagittal cross section of the pelvisThe urethra lies anterior to the upper third of the vaginaThe urethra lies posterior to the lower third of the vaginaThe bladder when empty lies above and anterior to the uterine bodyThe bladder when empty lies parallel and anterior to the uterine body  <response>: - The urethra is only 3.5 cm long and is anterior to the lower third of the vagina. - The bladder when empty lies parallel and anterior to the uterine body 