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Greater sciatic notch
Other Terms: Incisura ischiadica major, Grande incisure ischiatique
This is the large, deep notch on the posterior margin of the ischium, above the ischial spine and below the junction with the posterior inferior iliac spine. This notch provides passage to the piriformis muscle, the superior and inferior gluteal vessels and nerves, the sciatic and posterior femoral cutaneous nerves, the internal pudendal vessels and pudendal nerve, and the nerves to the obturator internus and quadratus femoris muscles on their course from the pelvis to the gluteal region.
Sciatic is a contraction of the Latin term ischiadicus from the Greek ischion meaning hip joint. A notch refers to an indented region of bone, the Latin equivalent of the term being incisure.
Incisura ischiadica major
Grande incisure ischiatique