Note: this collection contains dissection imagery that may not be suitable for all viewers. Discretion advised. Introduction to the Lateral Line. The Lateral Line brackets each side of the body from the medial and lateral mid-point of the foot around the outside of the ankle and up the lateral aspect of the leg and thigh, passing along the trunk in a "basket weave" (crossed-shoelace) pattern under the shoulder to the skull in the region of the ear.