<prompt> Which of the following structure doesnt pierce sacrotuberous ligamentInferior gluteal aeryPerforating cutaneous nervePosterior femoral cutaneous nerveCoccygeal plexus  <response>: Sacro - tuberous ligament. Structures piercing sacro-tuberous ligament are coccygeal branches of inferior gluteal aery perforating cutaneous nerve filaments of coccygeal plexus. 