We are approaching the border between the medulla and the pons. The fourth ventricle is getting smaller. The inferior olive is almost gone, and the lateral drift of the medial lemniscus is beginning. The component contributed by the Nucleus Gracilis (red = lower body) has been in the most ventral part of the lemniscus till now; as the lemniscus assumes a horizontal orientation, the red fibers will lie most laterally. Note the close relationship of the medial lemniscus to the pyramid.