Pelvis. Obturator foramen is 7.
Symphysis pubis exposed by a coronal section. Obturator canal labelled at center.
|Anatomical terms of bone|
It is bounded by a thin, uneven margin, to which a strong membrane is attached, and presents, superiorly, a deep groove, the obturator groove, which runs from the pelvis obliquely medialward and downward.
- one, the posterior obturator tubercle, on the medial border of the ischium, just in front of the acetabular notch
- the other, the anterior obturator tubercle, on the obturator crest of the superior ramus of the pubis
Reflecting the overall sex differences between male and female pelvises, the obturator foramina are oval in the male and wider and more triangular in the female.
Additionally, unilateral pelvis hypoplasia can cause differences in size between the obturator foramina, and there are even rare reports of individual pelvises featuring a double obturator foramen in one of the hip bones.
- Apostolos Karantanas; Konstantina Velesiotou & Evagelos Sakellariou (2002). "Double Obturator Foramen". Larissa General Hospital, Greece.