Structure crossing dorsal surface of ischial spine are all except
Pudendal nerve, internal pudendal vessels, and nerve to obturator internus after leaving the pelvis through greater sciatic foramen, cross the dorsal aspect of the ischial spine and then re-enter the pelvis through the lesser sciatic foramen.
Internal pudendal vessel
Pudendal nerve
Obturator nerve
Nerve to obturator internus