Three apertures in the pelvic wall communicate with the lower limb (Fig. 5.10A): the obturator canal, the greater sciatic foramen, and the lesser sciatic foramen.
The obturator canal forms a passageway between the pelvic cavity and the adductor region of the thigh, and is formed in the superior aspect of the obturator foramen, between bone, a connective tissue membrane, and muscles that fill the foramen.