Basic Anatomy
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external iliac vessels
femoral nerve
right ureter
obturator
vessels and
nerve
fascia of levator ani
fascia of obturator internus
obturator externus
obturator membrane
obturator internus
levator ani muscle
ischiorectal fossa
puborectalis
external anal sphincter
internal anal sphincter
anal canal
anus
inferior rectal vessels
and nerve
internal pudendal vessels
and pudendal nerve
transverse fold
of rectum
cut edge of peritoneum
ampulla of rectum
rectum
sigmoid colon
psoas
attachment of
sigmoid mesocolon
left common iliac vessels
left ureter
aorta
inferior vena cava
FIGURE 6.17
Coronal section through the pelvis.
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2
3
FIGURE 6.16
Stages in rotation of the baby’s head during the second stage of labor. The shape of the pelvic floor plays an
important part in this process.