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• The former is large, situate at the inferior part of the pelvis, and formed by the sacrum and ilium. It gives passage to the sciatic nerve, pyramidalis muscle, and to the superior gluteal vessels and nerves. The latter is much smaller than the other, from which it is separated by the sciatic spine. It gives passage to the tendon of the obturator internus, and to the internal pudic vessels and nerves.

1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison