sciatic notch
nounMedical Definition of sciatic notch
: either of two notches on the dorsal border of the hip bone on each side that when closed off by ligaments form the corresponding sciatic foramina:
a
: a relatively large notch just above the ischial spine that is converted into the greater sciatic foramen by the sacrospinous ligament
— called also greater sciatic notch
b
: a smaller notch just below the ischial spine that is converted to the lesser sciatic foramen by the sacrospinous ligament and the sacrotuberous ligament
— called also lesser sciatic notch