The piriformis is the most important muscle for the management of the Autonomic Nervous System. All the connections for the ANS are along the spine. The ganglion converge in a big jumble and the disperse in other directions. In front of the piriformis we find the colon, bladder and sex organs. The muscles in front of the vertebrae have a huge relationship with the plexus. It would be wise to know how to stretch the tight fascia of the 
piriformis.