Os coxa- obturator foramen

Lateral view (superficial surface), left side

Two of the three bones that make up the os coxa contribute to the obturator foramen. They are the pubic bone and the ischium. Most of the foramen is closed by the obturator membrane, which is a flat membrane made of connective tissue occupying the inferior portion of the foramen. The obturator canal is small, but remains open allowing for communication between the lower limb and the pelvis. The obturator nerve and obturator vessels run through this canal.