Greater sciatic notch refers to a notch on the posterior border of the hip bone between the posterior inferior iliac spine and the spine of the ischium.
It is converted into the greater sciatic foramen by the sacrospinous ligament.
The notch holds the piriformis, the superior gluteal vein and artery, and the superior gluteal nerve; the inferior gluteal vein and artery and the inferior gluteal nerve; the sciatic and posterior femoral cutaneous nerves; the internal pudendal artery and veins, and the nerves to the internal obturator and quadratus femoris muscles.
Of these, the superior gluteal vessels and nerve pass out above the piriformis, and the other structures below it.
The greater sciatic notch is wider in women than in men.
Keyword: greater sciatic notch