The spiral line creates a loop around the body in two opposite circles, to the right and left. It combines each side of the skull, crosses the thoracic spine back to the opposite shoulder. Then, it goes around the chest to the front to cross the navel and goes down to the hip.
From the hip the spiral line runs like a jump rope down the outside of the front thigh down to the outside of the foot. It makes a loop under the foot, continues up again towards the outer thigh more towards the rear side of the ischium. Further, onward they cross again and merge into the erector spinaes fascia.
This line stabilizes the body in all planes through its double enclosing loop. It connects the foot with the pelvis and is important in the regulation of the knee position when we walk; When bothered this line causes rotations and imbalances throughout the body.