Note: this collection contains dissection imagery that may not be suitable for all viewers. Discretion advised. Introduction to the Spiral Line. The Spiral Line loops around the body in two opposing helices, right and left, forming a double lattice joining each side of the skull across the upper back to the opposite shoulder, and then around the ribs to the front to cross against at the level of the navel to the hip. From the hip, the Spiral Line passes like a "jump rope" along the anterolateral thigh and across the shin to the medial longitudinal arch, passing under the foot and running up the posterolateral side of the leg to ischium and into the erector spinae myofascia (of either side, depending on posture or activity) to end very close to where it started on the skull.