Most of the vessels supplying the structures within the pelvis lie in the extraperitoneal fatty tissue which intervenes between the peritoneum and the fascia. The nerves, at first, lie outside of the fascia and are not only retroperitoneal but, like the muscles, are also retrofascial.
KeywordsIliac Artery Internal Iliac Artery Psoas Muscle Neurovascular Structure Piriformis Muscle
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