9. Avascular spaces
Lateral spaces:
•Paravesical (divided by umbilical artery into
lateral and medial spaces)
•Pararectal (divided by ureter into lateral and
medial spaces)
•The fourth space (Yabuki space)
Median spaces:
•Retropubic (Retzius) space
•Vesicocervical/Vesicovaginal spaces
•Rectovaginal space
•Presacral or retrorectal space